Who do I talk to about getting some money from my husband? I have zero access to his acct. We live together etc and I need to go to the dentist etc and he wont give me any money. 

If you live together there isn't much that can be done because in the eyes of the military he is providing a place for you to live and food to eat. Nothing more is actually required of him. 

Sounds like the dentist should be least of your concerns - I would be second guessing my marriage! 

Its been like like since we been married 7 yrs 

So why stay? Free housing/healthcare? Why haven't you tried counseling or walked away? 

Option 1) you should talk to his CO and tell him everything. Thats what the Marine Corp there for, to settle marriage disputes and make husbands submit to their wives. I mean if he worked at say a normal job you know the CEO's door is always open and you could tell him your husband doesnt give you money and he would make him!!!
Option 2) Just get a job, alot of women do now in days and they even have kids too. 

Maybe I should walk away 

I honestly think hes addicted to pain pills and thats where his $ is going. He said hes broke because he put more $ on his car payment. ( Why would anyone do that around the 15th. I said let me look at your statement so you can prove me wrong, He said I was F*cking nuts and wouldnt show me. And he always sniffing or has a running nose. 

Just get a job, alot of women do now in days and they even have kids too. 

True Story!! I went to school while I was a single mom. Started my career job shortly after marrying my husband. The only reason why we dont have a shared bank account is bc (1) I make more money than he does (2) I refuse to allow any of his money to help me support my children from my ex-husband and (3) I'm, in a way, high maintenance (getting my nails and hair done) and I wouldn't want his earnings supporting my personal maintenance that I can financially handle myself. 

:( That's sad. There's not much of a marriage without communication. I hope you get things sorted out.