Hey, I'm so sorry you're suffering so badly. Well done on the initial weight loss though, it's typical that HS got in the way of that for you. I've never been on either of those meds you mentioned, I've gained small amounts of weight with other meds though.

For starters, see what it is that's making you gain weight, are the meds increasing your appetite or causing you to retain an awful lot of water. The biggest thing that helped me was counseling. I gain 2 stone since my hs diagnosis, i gave in to the hs and became sedentary because of it. But I found a really understanding and cheap counsellor, who tried to understand the condition and then help me improve it as much as i could based on my mental state.

Since I came out of a depression and have learned some stress-relief techniques my hs has improved enough to allow me to do some yoga and some jogging. Stress and depression seemed to be the biggest triggers for flare-ups for me.

Another thing, check your bloodwork, check your b and d vitamins. my d was very very low (which is very common among hs patients) and since taking supplements it has improved even more allowing me to use some machines in the gym. Also have you heard of Tara Grant? She released a book called "Hidradenitis Suppurative: The Hidden Plague", it's all about how changing her diet helped put her hs into remission. A fantastic and enlightening read backed up by various medical studies.

But firstly sort out your mental health, the rest will follow naturally. Seeing a counselor is honestly the best thing I've ever done to help my hs. Please feel free to message me if I can help any further.

I wish you so much luck with getting this thing under control. It's a horrible but worthwhile journey.