Potential for problem(s), yes.

Agree with some of the comments previously made, and suggest -

1. Regarding potential pharmacist review, if your healthsystem or clinic has a pharmacist specified for reviews you might pursue that. For example, some systems have a team approach and a clinical pharmacist assigned to the team. They may call the team a patient centered medical home.
2. Regarding clonazepam, gabapentin, plus pregabalin, I am hoping part of your team have training in psychopharmacy (Psychiatry, NP, PharmD, other).
I don't believe the team would combine clonazepam, gabapentin, and pregabalin.
3. Caution on the doxylamine for sleep. Similar to diphenhydramine, although available over the counter for short term use in sleep, they aren't recommended by sleep experts.
4. The pharmacist and your team will benefit from a careful and complete review of OTC and prescribed meds. It may be eye opening for you. Please note the American Geriatric Society ""Beers" guidelines would recommend caution on many of the medications you may be using long term daily, including doxylamine, melatonin, meloxicam, and clonazepam.
5. Last thought, hoping the pharmacist and your team are monitoring the levothyroxine thru laboratory tests such as TSH, and your symptomatic response. In older individuals levothyroxine is reported to be overprescribed - patients with slightly high TSH but normal for age may be given levothyroxine without clinical benefit. For more information search on NEJM and Mayo Clinic and elderly and levothyroxine. Too much levothyroxine can contribute to insomnia, and other adverse outcomes. If I were in your place I would not use levothyroxine if my TSH was normal or just slightly high, particularly without symptoms. Of course, you might have been symptomatic and had a very high TSH, just something to be aware of.

Best wishes