Hello, I'm A 28 Year Old Female, I've Been Experiencing

Hello, I'm a 28 year old female, I've been experiencing some breast discomfort, on the sides of both breasts they have got a little bit bigger/firmer but not hard, I don't think I could be pregnant not sure if I was it would be too early to tell as I had my period on the 19tj of Sept, & also have a 27days cycle, so that would make me on CD18/19, also I've had some back pain just above my hip part nd mild pain just below that but not much if I did pay much attention to it when I 1st had pain above that. Also the last to days I've been getting a little dizzy but today it happened all day EVERYTIME I get up or walk abit I start getting dizzy but doesn't last long at all and I'm not getting up too quick or anything, the last symptom I've been having is pain on & above my Pubic bone some are little stabbing like feeling and a ache feeling but it comes & goes. Oh that reminds me the other day I got some stabbing like feeling (like striking stabbing feeling where I had to hold down the and tried to hold my breath it was painful but it didn't last long it happen again about an hour after but was not as bad) sorry for TMI but is this normal or a bad thing?
I would really appreciate any information that would help.
Thank you in advance. L&L