Pregabalin can cause side effects like unsteadiness, memory loss, lack of coordination etc.
The alternative is non-opioid analgesics like Acetaminophen
and topical analgesics like Lidocaine patch, at a dose of 1.8 % or 5 %-applied over the sites of pain for up to 12 consecutive hours per day.
Capsaicin 8% patch -up to 4 patches are applied once for 30-60 minutes. Over the counter preparations (Iodex)of menthol, methyl salicylate
though weaker have an effect on pain.
Anti-depressants like Duloxetine, Amitryptiline have also been used for chronic pain and benefits are outweighed by side effects in most patients.
Other anti-epileptic drugs besides pregabalin (as you are intolerant), are Oxcarbazepine
, Carabmezapine, Lamotigrine, and lacosamide used for neuropathic pain
with variable success.
These are all prescription drugs. You can additionally go for complementary therapies for chronic pain like acupressure, meditation, yoga, massage, chiropractic, guided energy, and biofeedback.
Hoarseness of voice and weight gain(6 kg) warrants exclusion of Hypothyroidism
( go for serum free T3,free T4 & TSH level).
Hope I have answered your query. Let me know if I can assist you further.
Dr Tushar Kanti Biswas, Internal Medicine Specialist