Did the FA get physically ill a lot?

My ex never seemed to get sick, maybe a cold once or twice but he works from home so he is not exposed as much to others and their colds. In terms of any other maladies, I never noticed anything, but he was very stoic and would probably see it as weakness to complain. Also because we saw each other on a somewhat stricter schedule, all the times we were not together he may have shown some illness.

I think it may have been me who initially flagged this - people who are not in touch with their emotions, may instead recognise feelings as somatic sensations and dis - ease as illness.

I feel uncomfortable in my body before I recognise that I am "stressed" and my avoidant ex would often complain of a vague malaise which seemed to coincide with times when you'd expect another person to be feeling emotionally hurt. He often couldn't pinpoint exactly what the feeling was - infact when we talked about how his body felt during a long and challenging exercise session he wouldn't be able to articulate anything other than feeling he needed to stop,

Interestingly, he also wasn't great at noticing physical sensations - it was as though everything was totally seperate from his thinking mind and he had no idea of what was going on with his body rather than a vague feeling of uncomforatableness. Part of my learning to access emotions has been a recognition of the connection between physical sensations and emotions - or repressed emotions. In an avoidant person feeling physically unwell in a vague sense my represent an uncomfortable repressed emotion.

the one I dated felt sick (nausea) on our first date and actually quite a few times. He was also afraid if heights, germs and was so claustrophobic that we had to change a restaurant reservation once because he felt enclosed He also had hypochondria and was generally a worrier about his health /losing his job and security (even though he was pretty rich and very unlikely to lose him job). All round I guess he was a fearful person.

All the time!!!! Migraines, headaches, nausia... I am absolutely convinced that most of this was a physical expression of suppressed and conflicted emotions.

I remember watching a YouTube video by a British attachment theory researcher discussing her book where she says avoidants(she seemed to class DA and FA the same) typically have poor immune systems due to stress(she didn't really site if this was stress from their familial relationships, the stress in dealing with people, stress from a lack of close relationships, etc) over long periods.
I've not seen much else on this except some studies that show that anxious and avoidant people do tend to have poorer health than secure people.
My avoidant ex had a terrible immune system. He got sick very easily, respiratory, gut, and skin infections all the time. He actually caught hand, foot, and mouth disease in his 30s which the doctor said was extremely rare. I have a number of friends with HIV and another on immune suppression due to an organ transplant and all of them seemed to get sick less frequently than him.
It often ruined a lot of events, my first birthday after we started dating, moving into a new place, vacations, going to parties together. I don't know if it was necessarily relationship stress or stress in general. He said he would often get sick after flying on a plane and this happened regardless of whether I traveled with him or not.
About a year after we broke up he posted how his year had been terrible due to two break ups, two moves, work stress, and a slew of minor illnesses so not sure if there may be anything to glean from that info.
I'd say it's likely that at the very least avoidants are more prone to using illness to get out of intimate obligations. As far as to whether they get sick or maybe think they are sick more I have little to make a confident assertion on.

Honestly, I've found in the past that I tend to feel ambivalent, but I also don't want to lose control. Because I'm attached I can't leave them, even if looking back I can tell I didn't like them. So you never open up about the ambivalence and just hide it, and never end things either. This also puts (at least for me) in a state where you literally can't make a decision about how you feel, so one is never made until it falls apart. So you act like everything is fine, but in reality there's a bit of anxiousness and worrying down deep inside. Then when you "cross an intimacy threshold" it all comes crashing down. The sickness, in my case is violently bad gut feelings and intense anxiety. Headaches, migraines, etc. It's anxiety so bad its manifesting itself as physical symptoms.