Can I have PTSD from greening out on marijuana?

5 months ago I tried weed for the first time with my boyfriend, we had edibles and took too much of course because i wasn’t getting a kick at first (DONT DO THIS EVER ALWAYS WAIT A WHILE FOR IT TO KICK IN) At first it was super funny but then i started to what some people call, greening out, the negative experiences of weed. Extreme fear of death, while this was happening my boyfriend started vomiting (probably from the weed) and he was coughing a whole bunch during that time as well because he had a virus. Him vomiting was incredibly horrifying to my high as fuck self because i thought it meant he was dying. I was having a panic attack while he has vomiting. Later when we tried to start sleeping, we both had muscle spasms. The following two days I was in a horrible state of derealisation and depersonalisation, perhaps I even entered psychosis.

Now, whenever i hear very strained coughing I immediately tense up, close my eyes and stop breathing. When I was vomiting due to the flu, I was completely petrified right before i vomited. When my muscles twitch sometimes while in bed I just freeze and remember the events.

I haven’t been to his house since, due to long-distance, but simply thinking of his staircase makes me cry.

Is this PTSD? What can I do to help myself? I can’t afford a therapist.