Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain as you have
severe pain in tooth, bad taste in mouth along with a pimple over the gums, there seems to be deep decay in tooth that has lead to spread of infection below the root tips of the tooth and leading to formation of a
Dental Abscess..
The pimple over the gum seems to be due to pus accumulation in the gum tissues..
Headache seems to be due to
radiating pain from site of infection..
I would suggest you to consult an Endodontist and get evaluated and an x ray can be taken to confirm the diagnosis and treatment can be done accordingly..
In case if tooth is in a condition to be saved,
Root Canal Treatment can be done followed by antibiotics and painkillers..
In case of extensive decay extraction of tooth is advised..
As of now you can take painkiller like Ibuprofen or
Ketorolac to relieve pain..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.