Are there any prescription meds or over the counter products to help me gain weight?

Yes / Why! There are a lot of over the counter supplements that are high calorie protein supplements that can help, some are available by prescription or OTC and there are medications that can help with weight gain, the OTC ones promising muscle bulk are hype for the most part. The real question here is why? Does it run in the family? Are you underweight? Losing weight? Thyroid checked? Adrenals checked?