Not available directly from a GP, but if one gets referred to a clinical psychiatrist they can permit a prescription.

True. But it won't be easy. You will mostly likely be put on combination therapies first. Then onto combo SSRIs and Antipsychotics, then maybe you might get something that ups dopamine, maybe. If you look a bit bipolar though you'd likely go onto a mood stabiliser (i.e. calm the f down you over-active neurons, have some more gabba/ block those calcium channels etc). and personally that's what worked best for me, over active mind induced perpetual exhaustion -> anhedonia from the stress of a mind that never stops.