Whilst I agree with everything else Agnurse says, I'm not convinced marriage counselling is the best way forward.
Marriage counselling is often considered last chance to save to marriage. Not engaging with marriage counselling good grounds for divorce for many. And if it works that's great
But marriage counselling puts an awful lot of pressure to engage in a high stakes, super intense social interaction. On someone who may be struggling with any kind of social interaction. When their primary, maybe only , social relationship and support hangs entirely in the balance.
Generally if someone is struggling you reduce the demands not increase them.
First thing work out what you want. Can you do it all?Do you want to go it alone? Do you want to stay even taking into account the weaknesses of those around you. Always save yourself first you cannot help others if you are drowning. Individual counselling may be more productive than couples.
Recognise everything you do for everyone. If you are going to be a carer take some pride in what you are doing and what you are achieving.
Change the language. I need you to support me is too vague and liable to produce panic and avoidance behaviour "I need a hug" doable "if I need you're help with DC I will tell you" "can you cook xyz for dinner" make the opportunities for successful interactions within your relationship. Lower other social demands as much as possible.