Sex after giving birth

Hello mommies. I just need some advice or maybe I just wanna hear some thoughts. I am almost 4 months postpartum. My husband just came back from work since he is a seaman we have been on a long distance relationship for months. The last time we have been together was on the day I gave birth. I know my husband misses me so much and part of it was having sex. (This is for open minded people only skip if you find this disturbing) Anyway, I have this problem and worries that results in me not properly participate in our love making. Idk but it is really painful when we do it, and I am really anxious because I kept thinking about the stitch I had when I gave birth normally. But it is really painful though even if we do long foreplays. To conclude this, recently he does not feel good about this. I think he might feel disappointed and it makes me feel so bad. I really do. It gave me anxiety I even cried idk why. I just wish it was easy just as like how we do it before I gave birth. If you have any advices on how to do it comfortably and properly please do comment. And if you have any advices on how should I feel and think about this, please do comment. Thank you!