Anti-convulsant, muscle relaxers (flexeril
, soma, or a benzodiazepine like Valium used off label), <span style = 'background-color: #dae8f4'>and</span>
a anti-depressant (if you stay on the Tramadol, the dosing of the anti-depressant needs to be started low to reduce the risk of serotonin syndrome as Tramadol possess properties that act like a anti-depressant.
I don't know what your dose was of the Gabapentin but you may just need the dose increased. Medications are all started at the lowest dose to minimize side effects.