Hi.
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain you have got a severe
allergic reaction to the toxic chemicals released by the spider or any other insect leading to swelling and pain.
You are not on a correct treatment and the first thing you should do is to consult an Emergency Room..
You need to take Oral and injectable antihistamines like Benadryl or Allegra which will reduce the allergic reaction and will reduce swelling and pain..
The doctor may also prescribe you Oral Steroids like
Prednisone or Medrol which will reduce inflammation..
You can continue taking
Ibuprofen for pain relief..
Do cold compresses over the lip..
In case if there is congestion or difficulty in breathing due to swollen neck decongestant
nasal spray can be used..
If there is infection diagnosed after clinical evaluation antibiotics like
Augmentin will be advised to you..
Hope this information helps...
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Thanks and regards..
Dr.Honey Nandwani Arora..