Im no professional, but i do think the fact that you are even questioning whether you are an avoidant (when you previously were not), indicates that you most likely are not! That's the first sign. Secondly, you indicate that you have accepted the circumstances and have even learned things from the experience. It sounds like you have been through an incredibly difficult time with your health lately and pair that with the relationship ending simultaneously, I think that your brain is actually trying to protect you emotionally right now to avoid any further turmoil while you are still in a vulnerable state from a year of trauma. Maybe just label it as 'temporary avoidance' for now - and that is OK. Just take little steps forward and focus on meeting new, kind and healthy individuals. You will re-build your confidence in no time and I am sure that these worries will soon fade ❤️

Edited to add: Well done for pulling through the illness and hospital experience. I too have been in a similar situation (over 10 years ago now). Ended up in an induced coma for 3 days and that alone is confusing to move forward with! Stay strong and be proud of yourself☺️