I was outside and suddenly felt a sharp pain on my back, then another in a different spot. i think something bit me. what could it be? how to deal?

Antihistamines, etc.: For bug bites, one can take over-the-counter claritin, zyrtec, or Benadryl (diphenhydramine) to block histamine, which causes itching. Putting Hydrocortisone 1% cream 2-3 times a day on the bites for about 5 days will help them go away. For more itch relief, one can add an anti-itch gel such as "itch-x" on the bites. Itch-x has an anesthetic to numb the itch. If bites are growing or painful, a doctor can evaluate.