Hi Bobby,
I'm really sorry you're finding it so hard. Try not to beat yourself up. You can only achieve as much as you are able to at a given point in time. Sorry if that didn't make sense. There's no point in being cross at yourself if you really are too ill to get outside and run.
Sometimes you just have to be kinder to yourself and try again in a few days. You can't will yourself to be well again - if you could you wouldn't be taking the anti d's in the first place.
Sorry I'm really not explaining myself very well, I know it's really frustrating and it's hard to see the difference between those times when you need to try harder and those when you need to back off.
If it's time to try again then I think the most crucial thing is to re-establish a routine. Forget about distance, pace, speed sessions etc just focus on getting back into the habit of running. I live near a park, if I've been off for a while and my motivation is wounded I just aim to run one lap of the park every morning for a couple of weeks (it's only a mile round) the hardest bit is getting back to the point where you are looking for reasons to run instead of excuses not to. I find making it a non-negotiable part of the routine achieves that.
I don't think there are any magic solutions, as you can see from this thread I suffer from the CBAs sometimes too. You're judging yourself by a much harsher standard than you are judging me.
If I'm feeling overwhelmed by people I jam a hat down low, put earphones in (with or without music) and run early in the morning. Or drive somewhere further afield and run where I won't know anyone.
Look after yourself Bobby (and let us know how it's going)
If things are really bad talk to someone honey, I don't know what I'm on about really but there are people that do!