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Dry sex can cause minor trauma to the vaginal walls leading to acute inflammation. Possibly this is what is occurring in you. The risk of an infection setting in the cracks in the vaginal walls is high. Possibly some amount of infection has already started since you are very sore
Please consult a doctor for a checkup and antibiotics. meanwhile, please apply a cold pack to the vulva for 10 minutes twice a day. Use a vaginal soothing gel like vagisil (this is an anti-itch cream but will work for you too) or Rephresh vaginal gel. take ibuprofen 200mg tablets twice a day. You can also apply a local anesthetic like Lignocaine gel for temporary relief.
But do contact a doctor for a checkup.
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