If you're having some solo fun, I recommend a string of small beads. When you feel yourself hovering at the peak just before orgasm, pull them out. This could put you over the edge. Just be sure the beads you purchase don't have absorbent string holding them together. You want them connected by a material that can be thoroughly cleaned.
Of course lube is a must for these products. Whichever lube you like, make sure you use more than you think you need. You can never have enough back there. If it starts to get sticky, just add water. Slicks it back up.
I do not recommend supplements for anyone with an underlying medical condition. Most herbal formulas are erection pills, and you don't need those. What you really need is increased sensitivity. For that I recommend you purchase one of the topical clitoral stimulation products marketed for women. They have the same effects on men's genitals, which are temporary dilation of the blood vessels, and increased perception of temperature and texture. My favorite is WILD by System Jo. An alternative is Orgasmix, but I only recommend it be used for 5 minutes or less. Don't apply it until you think you're near orgasm. It contains an amino acid which, while effective, can also leave you feeling raw.
I wish you luck in your efforts. I know how frustrating it is. I'm a woman, but I deal with men every day who experience the same problem. I always tell them to keep trying. If one thing doesn't work, try something else, or a combination of things. It's amazing to me what doctors don't know about sex, and how little they care about their patients' sexual health.
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