11 month sleep regression?

Is anyone LO going through the 11 month sleep regression ? Ours was on a great schedule with naps and bedtime and went down without a prb (self soothed). As soon as he started to stand in his crib, GAME OVER!!! He fights his naps which pushes our schedule completely off. I have to take roughly 1hr to get him down for a 1-2 hr nap but reinforcing him to lay back back down and patting the mattress saying ‘no, it’s sleep time’ and rubbing his back while he cries the whole time. When I say no he throws his body back and has a temper tantrum and ends up hitting his head on the side of the crib in the process which I know hurts him really bad (he ends up doing his painful cry [this is painful for mom to hear]). Nights haven’t been bad, but what is everyone else doing if your going through the same issues?? Any advice would be great. Thanks