Does anyone else ever feel v overwhelmed when thinking about their mental illness(es)?

I have severe OCD, social anxiety, GAD and depersonalisation disorder, and sometimes I feel so infuriated by how much that feels to take on. 
It’s like there’s this huge long list of mental illnesses with different names in my head and sometimes I wanna scream just thinking about each one. 

I don’t mean to sound insensitive in any regard here because I know a lot of people may have numerous mental illnesses and some may only have one - each struggle is valid in its own right. 

I guess just for me personally it feels like too much to deal with. 
I don’t even know where to begin and it seems unrealistic that I’ll ever reach a point where I’m not affected by at least one of these illnesses. 

I’m not an unhappy person - I have people and things in my life that I love but I just feel like I’ll always be held back from my full happiness by these different things and that feels so unfair.