Not sure if this is the right place to ask about this but I was hoping for some advice.

So two nights ago I ended up taking two hits from my roommate's boyfriend's joint. I never smoke and he does it daily so I'm pretty sure he had something with a lot of THC, which I know can be bad for someone with anxiety (I'm an anxious person but not diagnosed, I do have ADHD though). Anyways, I started to get really quiet and nervous so I went to my room, which was when I think the panic attack set in. It was a really scary experience and I was super anxious + paranoid and had auditory hallucinations. My heart was pounding and I felt like I was losing control/gonna die. 

There was a bunch of other stuff that happened but I won't go too much into it, I think it lasted around 20-30 minutes. I did a lot of research the next day and I'm pretty sure it was a panic attack? Not entirely sure but I was wondering what I should do moving forward. I'm definitely not touching weed or any other drugs again. Should I see a therapist or should I wait until/if it happens again to get help?