Suggest Treatment For Mental Disturbance

Hi, I took lsd once about 10 months ago now and about 2 months ago i started to have what i think are flashbacks, they are very scary and are happening more frequently as time goes on and more intensely, I was fine for about 6-8 months after using it and then they just started happening all of a sudden, it seems that they only usually happen when I'm around friends but also happen more rarely when I'm at home, I usually have one every couple of days but they are making me not want to go out or do anything, the only place i really feel secure is at home and I don't really want to induce agoraphobia, is there anything I could do to put a stop to these flashbacks as it is affected my everyday life, thank you