Any doctor can order a B12 blood test. Interpreting it is another matter.

In general in Japan, anything below 550 or so is treated.
Here in USA the cut offs are lower since we have not had the medical
emergencies with B12 that Japan had. (the Vioform disaster-- a terrible drug
depletion event). Doctors here often consider 200 normal, and it is not.

So get a test, and get the results and bring them here. Oral B12 is OTC and you can do this yourself. Since B12 is easy to do and non-toxic it is less of
an issue than with the IRON, believe it or not!

Pamelor depletes B2 (which when low results in poor B6 conversion to pyridoxal by suppression of the conversion enzyme). And also CoQ-10. Since you are taking both B-complex and a multi--this should not be an issue. The CoQ-10 depends on length of time, and symptoms..(bleeding gums, periodontal disease, extreme fatigue with exercise intolerance).
Hypothyroidism can cause failure to convert betacarotene to Vit A in the body. This shows up as orange/yellow tint to skin most noticeable on the palms and soles of the feet. If yours are not affected, your vit A is probably working now- and converting well.
People using thyroid supplements need to attend to zinc and selenium. If you still feel cold/slow in spite of the medication, look at your vitamins and make sure you are getting zinc and selenium from them.

Your other meds do not show up in the reference I have as depleters.