Cannot sign in to my account ...I tried to sign in a couple of months back. I could not , now up against the deadline I am trying again. what is up?

I seem to be locked out of my account.  I have tried several times, and even changed my password so I might be able to sign in.  And I have had no luck.

I am getting nervous about this. 

I have to have cancer surgery soon, and would like to have this behind me.

I hope you can help me.