Hello guys :)
I used to always have a nice time on uppers like coke, speed or mephedrone. However, since a few months I have been getting pretty anxious when I take them and just dont have a good time anymore. The only upper I can take where I know I feel nice is MDMA, the other ones make me less outgoing and social. Sometimes (probably depending on the substance) I also have a good time on mephedrone, but since a lot of times you are not actually getting 3mmc or 4mmc but something else its hard to say which substance causes anxiety and which one doesnt.
I will take a break for a few months and hope it will change again since I enjoy taking them every once in a while when I go out and would hate if it stayed like this.

Has anyone made similar experiences or has tips what has helped them in these situations? What could have caused this? Thank you
INFO: I was taking drugs maybe once every one or two months for the last year. So I dont think it was abuse, just lost the pleasurable effects.