If you think supplements would help, there are a few multivitamins out there which are easier to swallow as they are in a dosage of two tablets and/or twice a day. This makes the physical size roughly half the standard size primarily in diameter.
Many Phyicians and pharmacists often tell us to simply cut a large pill in half (usually with a pill cutter) however, doing so does not decrease the diameter, only the length. The diameter is the swallowing issue.
Search for these smaller multivitamins by either dosage or by sound when the opaque container is shaken, as small pills have a higher pitch sound than big clunky tablets do.