My ex is driving me crazy!

We have a 5 year old son together but our relationship didn't work out, I guess it's kind of complicated. We were in a relationship for 7 years (got together when we were 15. I am now 26) I was a naive child then, didn't understand anything. He smoked cannabis, drank a lot and often and I know some of his family members got in trouble with the police quite a bit (don't ask what I ever saw in him because I haven't a clue, I just know we had a few interests in common, like I said - I was naive)

I have moved on, I'm with an absolutely amazing man who has encouraged me to do the things that I held back from doing before and go back to college to become a qualified teaching assistant (I'm now in my 2nd year) and he is soon to be my husband ♥️

Anyway, my ex sees our son on Tuesdays after school and has him overnight on Fridays and Saturdays (my ex was the one who wanted these days). Why does he keep wanting to change the days? Or better question, why do I let him? 🤷

Other than the constant let downs of the days/times, there's also the issue of him allowing our 5 YEAR OLD to play video games that are rated 18. I have told him that I completely think this is totally out of line, our child should NOT be seeing those sorts of things.

I also have the feeling that either he, or someone in his family, is still smoking cannabis in the house when our son is there. There is also another child that lives there.

Anything I say to my ex gets completely disregarded. I feel like I'm having to do the parenting job of 2! Since when my son comes home from his dads, the attitude he has is appalling! (My guess, lack of rules, discipline and care)

Just to add, I am currently coming off antidepressants (for the second time) so anything and everything can set me off mentally and emotionally.

I need advice on what I should be doing. Should I report this to someone? Who??

I feel completely lost and that I'm not doing right by my son, but I am DONE being the naive, scared little girl I used to be! I know I have to do something, I'm at my wit's end.