I know that when I began my treatment that it took a little while to get used to it. I have Low BP so I have dizzy spells all the time. Maybe you should call the compound pharmacy and see if you can skip a day or maybe even try a slightly lower dose. I do know that once I was on for a couple of months they had to bump up the dose as the body does become tolerant. I even read somewhere that people would open the tabs and mix with juice or water to reduce the dose (drinking half)to see if that made a difference in their symptoms, but as always I would run it by the prescribing doctor.
Low Dose Naltrexone, used to boost the body's natural endorphins in response to pain. It is a compounded med and generally prescribed for a host of immune disorders. There is some info online if you do a search.