I can't orgasm and I think it's all in my head, help!

Alyssa
My best friend's mom (who is kinda my mom let's be real) is a pure romance consultant (she sells sex toys). At first I felt super awkward asking her what would best suit my needs. But I had a discussion with her and we found one I might like and I purchased it. Oh my god, this is the closest I've ever come to orgasming. I get close and then I feel really overwhelmed by it all. I think it's because I have had really bad panic attacks for the last 11 years and it reminds me of that feeling (tightness in the stomach, warm all over, zoning out). It makes me feel good,unlike the panic attacks. 
My question is, how do I overcome that psychological barrier? I just want to feel good.