Music is a great outlet. I was lucky. My mother was a good pianist and she taught me. My grandfather played very good Irish Folk Music on the Violin so he taught me that. Learnt guitar at primary school, we had a visiting Music teacher who came once a week. Flute I taught myself. I just bought one and an instruction book. I was heavily involved with music at one time.
When I left home I went to live in a commune. Loads of us played various instruments so we'd just get together in the evening and play. We did play on a pro basis, mostly pubs in Oxford. We went under the name of Marseilles Pure, one of my early Heroin references. At my best I could play pretty well and write songs for the band. But my fingers aren't as flexible as they used to be. I manage the guitar still but I don't know about the others.
Synesthesia is an odd experience the first few times but you get used to it. I can't say that it ever frightens me. It can get confusing if you are trying to play something specific but if you are just improvising it can add to the enjoyment.