Does your lecturer know about your difficulties? You probably don't need to tell them but you could just say; look i appreciate we need to be taught about this subject but i find some of it too uncomfortable to deal with at the minute is it possible i could be excused when i find it a little too difficult? Perhaps your lecturer could do a powerpoint/draw up some kind of document listing the key points and send it to you so you can look over it when your feeling a bit more stable? Sorry to hear your still feeling bad honey, sending lots of hugs