I think different psychedelics all have different potentials for bad trips. When I was new to psychedelics (I was using them about once or twice a week at the time, and had tripped about 4-6 times before this trip) I had an extremly bad trip on high dose DOM and it fucked me up, but not for that long. Also DOB is brain damaging, but a single trip on half a hit won't do shit. For your body DOx compounds suck, I have a large amount (at least 50 trips) of experience in this area. They're also proven to be bad for your heart, although they won't hurt you as much as 10 pills of ecstasy. By dirty roll you mean meth? Half a hit of DOB won't do any real tangible harm to you.
Recently (last november) I had a trip that destroyed me mentally. I did pharmahuasca (my first time doing huasca) mixed with mushrooms and lsd. I would've been fine with just the pharmahuasca and shrooms, but the lsd triggered a stage in the trip that was really hard for me mentally. I'm still recovering. That single trip made it impossible for me to truly interact with society, I was withdrawn from society and such before the trip, but it pushed it to a whole new level. I literally couldn't deal with other people, period. That lasted for a few months and I still have a lot of shitty problems with my brain, mainly extreme depression (I'm a chronic pot smoker, and that helps me with depression and anxiety, although it wouldn't help everyone) and very strong depersonalization disorder (caused by other drugs, brought out to a strong degree by the trip I'm speaking of) and HPPD.
I also had a lot of damage before that from excessive use of various substances. The only thing you can do is heal and live healthily.
I have two recomendations of things that worked (and are still working) quite well for me- L-Theanine and Rhodiole Rosea.
L-Theanine is the stuff in tea that makes you chill out. It's legal, not bad for you, not addictive, and not strong. It won't get you high, it'll just make you able to cope with otherwise unbearable situations (take 200 or 300 mg as a starting dose). It'll especially help with anxiety, I'd recomend trying it.
Rhodiola is the one that's recently become my favorite. It's healthy in many ways (for your heart) and I don't know of any harm it does. It also is an adaptogen, it helps you deal with stress and anxiety. It works great and is worth a try, I take 500 mg once or twice a day and I take L-Theanine at night.
I also take a variety of supplements -Tea extract, ginkgo biloba, selenium, L-Lysine, B and D vitamins, vegan DHA and sometimes a multivitamin, I live healthily and my diet is a well balanced vegetarian one. Another supplement that I didn't get much out of but that might be worth a shot is DMAE, which improves concentration and helps you function better.
Rhodiola and DMAE could help imrpove how your mind works quite a bit, especially Rhodiola. Don't feel bad about it, you haven't done much damage. Don't do psychedelic amphetamines anymore.
One last thing- the damage I have was brought out by that one trip. It existed from many other things (meth, benzos, booze, DXM, a lot of tripping on DOM and mushrooms and mescaline, a whole shitload of other stuff too). Also the trip I had was great, it's just the aftereffects that hit me. I'm extremly emotionally and mentally unstable at this time in my life, but it has gotten noticably better. Give it time, be healthy, try those supplements. You'll get better. I wouldn't recomend getting on an SSRI unless you don't mind being blank emotionally and being dependent on SSRIs, but that's for you to decide and a lot of people are genuinly helped by them.
It could be worse, I have two friends who overdosed (4 doses) in public on 5-MEO-AMT sold as liquid acid for their first trip.
Take life easy, take care of yourself. Next time only buy acid if you trust that its really LSD.