getting frustrated

33+5 today. Very high risk for preterm delivery. Last night the back pain started. This morning contractions were 10 minutes apart. Now they are not coming as frequently but these contractions I am having are so painful. Drank a lot of water and laid down all day and still having a few an hour. I don't want to bother my doctor or go to the hospital because I know they will just say I'm fine. But is this normal for the third trimester? Am I going to be in so much pain and so exhausted I can hardly stand? I still have to take care of my 15 month old but I never made it past 29 weeks with him so this is all new to me.