P.P.
Hi J., tender breasts are totally normal. Sometimes our hormones are stronger different months. Also, stress can affect our periods making them start sooner or later. and/or different symptoms. My cycle is 26 days on average and have always had tender breasts as part of my PMS. After having our son at age 33 (36 now) my breasts are even more tender. In the middle of my cycle, so about 2 wks before my period starts, my boobs hurt like the dickens and feel like they weigh 10 lbs ea. after taking my bra off . ;-) After I had our son, and my boobs started to hurt earlier on, I worried I was pregnant, but sure enough, just hormones. Aren't hormones wonderful????? So don't freak out yet. Wait a little while and if you miss your period then take a test. ;-) Or if any other weird symptoms, then see a doctor.
For the dizziness, are you drinking enough water? Could be low electrolytes. Eating too much salt can also cause dizziness. Builds fluid in the ears. Of course, anything gets worse, see your doctor. Good luck and hope all is fine.