Some random thoughts for you...
I think you're right, that there is a way to use meditation to heal yourself... and not just to cover up, escape, or ignore old wounds by seeking some imaginary place within yourself where anger & pain don't exist. The new-agey idea that we become "better people" when we are all peace, love & starry-eyed nirvana-addicts... didn't appeal to me either. There are other ways of understanding buddhist concepts.
I will probably hang on to the idea that there is a good type of anger till I'm ashes blowing in the wind... that was a total revelation to me, when I was introduced to it. That I'm ALLOWED to be that kind of angry - and it doesn't automatically tar me as a bad person. Telling this apart from toxic anger - now, that's a trick and a half. That kind of anger doesn't do a person any good at all... and yes, it is like a poison... maybe there are antidotes... things that render it non-toxic... break it down into non-dangerous single chemicals or something. But the easiest "home remedy" I've found for toxic anger is to simply "get it out of my system"... to vent, bitch, kvetch, whine, accuse, blame... to let it all out... oxygen and light have a magical way of burning all that kind of anger out; removing the radioactivity - and when it's gone... you don't need an antidote. I wrote all mine down; some here... but I didn't think it was fair (I absorbed some buddhist philosophy) to spew that out all over others, all the time. Writing let me do things like write in really BIG letters... really bold... in colors even. Keeping it bottled up - protecting others from how angry I was - only destroyed me. But I didn't want to be a viking pirate running amok all the time either... so the writing was sort of the middle path... to a way out. It let me have my cake & eat it too... coz once my writing session was done, once the "hangover" of intense emotion dissipated... I could more easily go about my day.
I had a weird reaction to meditation for awhile. When I was finally quiet enough mentally, the tears started to well up and roll out in torrents. Since that time, I've noticed that when I'm really, really, really angry... I cry. There is a symbiotic relationship - sometimes - between anger & grief. At least for me. Anger I was used to... but grief scared me half to death. I really didn't want to face what I felt was an endless black hole of feelings of sadness and loss. I felt my loss was of epic proportions... and that, like Pandora's Box, once I pulled the lid off that can of worms... there would be no end to it. Well - there is an end to that kind of toxic anger; and there is an end to "endless" overwhelming flooding loss and grief, too.
But to get started on letting all that out - I needed safety. I needed to know I was safe while putting it all on paper; safe to express it verbally with other people; safe to just finally let the tears roll out until I almost dehydrated myself. Safe to recover from all that emotion and to begin to feel different emotions, too.
When it comes up again now - and it does - it's nowhere as intense; it's more like a fly buzzing my nose or a leg cramp while I'm trying to center and sink into a centered, open meditation. And ya know what? I'm still different than a lot of people - because of having been to hell and finding my way back from it. But, it's in a better way now.
I don't know if there's anything in those thoughts or my experience that would work for you... but help yourself to any of the DIY-healing or home remedy "recipes" that look interesting and feel free to rework them & adapt them to yourself.