Rhogam shot!

33 weeks & just got my rhogam shot yesterday [yes, I know a little late] ! Prior to getting the shot i'd asked the nurse the side effects & she told me my bottom would be sore for a day or so & thats it. A few hours after id gotten it I started feeling extremely nauseous & dizzy. I got a severe headache & ive been having ALOT of pressure around my vagina. Its been about 18 hours since I got the rhogam & these symptoms STILL HAVNT GONE AWAY. Making me kind of anxious 😰