I found that it helped just having DH near by so when a contractions came I just called him & he stood next to me so I could squeeze his hand, dont know how squeezing his hand helped but believe me at the time it really helped.

I would suggest you explain to him that you may not be able to express what you want real well if your in alot of pain & you may not even be able to speak much depending on how worn out you are so ask that he has his ears wide open to hear you & I'd also ask him to keep one eye on you the whole time incase you're trying to get his attention but in too much pain to call out.

Good luck!