I had a hysterectomy as well and used to have this same problem. I think your body just changes after the procedure. You should be up some lube from your local drug store. Start off with just a little that way you don't become to slippery for your partner. Astrogel is a good brand and that product has been around for years. That was actually recommend by my ob gyn. Good luck! Just know that it's completely normal
Try some lube. They make all kinds.