I have PTSD and anxiety is the main symptom but i want to try DMT. Would i have a bad trip because of my anxiety? I'm fine with lsd but last time i took shrooms it was 6-8 hours of crippling anxiety.
Everyone here is assuming you're going to smoke it, but you didn't specify one way or the other. My only DMT experience is orally.
If taken orally, as part of ayahuasca or otherwise with an MAOI, the length of the trip can be from 2 to 7 hours, depending on circumstances, with stronger trips tending to go longer. I also found there to be a fairly narrow range of doses between a "dud" with only a body feeling and a "heroic" dose, which tears apart the ego. With mushrooms there seems to be a much wider range of "medium" doses. I personally haven't really had a high dose of mushrooms, and I tended to go for ayahuasca if I wanted a really intense experience being that I felt it to be more profound and ~2 hours of super-intense tripping is more than enough.
Just curious if anyone with an anxiety problem was able to use it and not go mad
There's no easy answer here, but if you are prone to anxiety, then you will likely encounter anxiety during trips on any psychedelic you use. Depending on the drug, dose, set, and setting, you may be able to steer your experience away from the anxiety, but in practice it can be difficult to control all of these things and you might end up in over your head at some point. When this happens, you can either fight it, in which case you may end up "stuck" in that state for a long time, or you can surrender to it. If you surrender to it, it will likely grow in intensity but may also generate new feelings, images, etc. It may take you back to the source of your PTSD. This could provide an opportunity to process the trauma, which could improve your symptoms afterwards, but it may force you to confront stuff that you aren't ready to process, which can leave you worse off afterwards.
My advice is to proceed with considerable caution and consult with an experienced therapist, if such is available to you. As noted by others above, most therapists prefer using MDMA over other psychedelics for PTSD treatments because it's more gentle and controllable for most people. That doesn't mean MDMA is always the better choice. It depends on the individual case. For some people (myself included) MDMA just doesn't work that well. If you decide to go this alone (which I cannot recommend), you should at least be supervised by a friend or family member who you can trust to provide the necessary emotional support through the process. It's also best if said supervisor has first-hand experience with psychedelics or MDMA if that's what's being used.