Spider Bite symptoms 20hrs later?

I believe a spider bit me around 9pm last night. I didn't have any effect, didn't feel sick or short of breath. Now, 20 hrs later, the wound has subsided a lot. It is not warm or painful or puffy. I am, however, beginning to feel real crappy. My lips feel a bit numb, I'm feeling a bit dizzy and woozey.

I haven't had much to eat today, maybe two turkey sammiches. I suppose it could be low blood sugar.

Can venom effects show up 20+ hrs later? Or am I just over reacting?

[Bhupinder Kaur, MD]

Hello,
I suggest you to consult a doctor as soon as possible and get any poisonous bites like of black widow , tick bite or brown recluse spider bite. They are dangerous bites and should be dealt with as soon as possible. I would suggest you to consult a dermatologist and get these possibilities evaluated.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.