Pelvic pressure almost like lighting

Going threw my vagina??? I'm 30 weeks pregnant my son is very low his movements are low he feels like he's in my pelvic area all the time my hips hurt etc... I was at the hospital last week for contractions but I wasn't displayed they told me to drink a lot of water. Is that the problem? Or is there more to why I'm feeling this pain down there's like he's going to come out