Is it me or is it him?

My boyfriend and I have been together for almost 6 months and I recently have been diagnosed with panic disorder. He's always been really understanding about it and has helped me cope. He even figured out my triggers so whenever we're together we can avoid them as much as possible. But lately I feel like he's losing feelings for me. I tell him when I feel this way and he always reassures me but I just can't shake the feeling. I'm not sure if its my disorder or he actually is losing feelings for me. Do you guys have any advice?

(I'm not allowed to take medication for it until I've had symptoms for 6 months)