how to pamper my husband?

It sounds like you need to find more time together (alone if possible). The fact that you don’t see eachother much makes it difficult to feel close, to talk about things, and have a heart to heart conversation. If you can not manage finding time during the week then try to find time on the weekends. Ask him to go for a picnic, a special outing together, even just a nice walk in the park, a museum, something that both of you would enjoy and that would give you a chance to talk and be together. You can also try finding little rituals that only you and him share together. If you want to pamper him, offer to give him a massage. For example, you could give him a nice foot massage and ask him about his day. It could be a nice moment to have together.

As for your mother in law, just be patient. Don’t get in between her and her son. Just let them be. Maybe your mother in law is cranky and in a bad mood and needs someone to be angry with. Try not to take things personally and try to understand that she is an old woman therefore she is like a little child that needs lots of attention and is always crying when they don’t get what they want. Of course, your husband needs to understand that he should not upset her with complaints because this worry is not good for her health. Tell him that if he has complaints he should tell you not his mother.