Yeah the trigger for me is visiting my family and few remaining friends who are clean. When I bump into people I used to hardcore party with with in passing it always will bring about some set of memories I had when we were "friends." I hardly ever visit because it always seems like I see those people at walmart or in town somewhere. I just choose to try and avoid that town like the plague.
This is why we are here, to help one another even by just giving our time to listen. Get it off your chest, vent if you must. It may lighten the load you are carrying. I hope you feel better later today.
This quote is most appropriate, as we usually say this when we are going through a tough situation, but at the same time, we are also looking at a brighter future when our troubles are resolved. And that we feel that after facing such situations, we end up a better and stronger person.
Another good one that kind of goes along with this one is "what doesn't kill me only makes me stronger". They are actually in tandem!
I get this all of the time and then I really beat myself up about it and I know how unhealthy it is but sometimes I just can't help it. It is a horrible feeling and unless you have had it, it is really hard to explain to anyone else. I have never asked anyone like you have though, maybe I should do!
As time goes by you will begin to feel better about yourself and find that you are coping much better in life. You have to be gentle and patient with yourself and make sure that others treat you the same way. Stay away from those who don't. This is a time for you to heal and you should not allow anything to come into your environment that may negatively affect you. One of these days you are going to be surprised at how together you are beginning to feel.
As @oraclemay said you do need to be very patient with yourself when overcoming addiction. I have posted this in another thread but it seems to help here so I will paraphrase. One of the ways I helped myself remain clean is to "reward" yourself with some of the money you save from not buying drugs. I like to treat myself to a massage, because almost everyone likes a good rubdown from time to time, it helps to relieve stress. Also you may treat yourself to a new outfit. Doing things like this is a great incentive to remain sober. Venting here is also an amazing tool.