Hi there K.,
I'm going to take the stance I always take and it's not very popular. 11 months old is not too young for a swat on the behind. Regardless of whether this is a phase or an attention getting behaviour (both of which are valid possiblities), he has to learn it is not acceptable. My suggestion is when it starts you say no, and give him a chance to stop. Then when he doesn't, because he won't at first, you give him a swat on his diaper, just hard enough that he feels it and knows you mean business. Then yes, I would agree with putting him in his crib until he can calm down and behave. At 11 months old, he may not understand why he's getting put in his crib, but he for sure will understand he doesn't want that swat. And the main thing is, whatever discipline you choose, you have to be consistent, every...single...time. And it's HARD to be consistent, but it's so very important.
More importantly, though, is your marriage. I have to tell you I so feel for you. There is nothing that drives a marriage apart faster than never being together. K., if you want to save your marriage, you and your husband need to sit down and figure out how you are going to be together more. You may need to change jobs or move, but whatever it takes, if you want to continue being married to each other, you have to do it. The two of you sound like you are essentially "separated" already and that sure doesn't seem to be working for you. I would even go so far as to say your son's behaviour may be a result of your marriage being in disarray. Children can sense when all is not well within the home, and the only way they can express their fears of their world being in danger is to act out. I encourage you to find some time to talk to your husband and decide whether you want your marriage to work or not. If the answer is yes, then without question you must find the time to be together, even if it's just in the evenings after the kids are in bed. I really feel for you in your situation, because I know right now people are desperately clinging to their jobs for dear life. But even if you have to downsize your life and live in a trailer park or move in with your parents or whatever, you've got to be together. Your children are sensing their world is unstable, I guarantee you, and that is the scariest thing imaginable for a child. I would also encourage you to find a support group such as a church or a group of moms to be around because you will need someone to lean on and gain strength from. I don't know if you go to church, but I do. My husband and I have been through so much in our 8 years of marriage and I don't know what we would have done without our church and the support they have been for us. I will be praying for you. Your marriage doesn't have to be and SHOULDN'T be this way. God bless, and lots of love and prayers your way.