For your sneezing and watery eyes, an over-the-counter non-drowsy antihistamine like Loratadine (Claritin), Cetirizine (Zyrtec), or Fexofenadine (Allegra) is highly effective. The weakness you feel is a common allergic response, but it can be worsened by older, sedating antihistamines (like Benadryl), so avoid those during the day. For your eyes, lubricating eye drops can provide quick relief. Ensure you stay well-hydrated and get plenty of rest. Please consult a doctor or pharmacist before starting any medication to ensure it is safe for you, especially if your weakness worsens.