I get it too, but have only recently realised it can be down to migraine, nuro diagnosed me with chronic migraine & did mention a lot of my other symptoms, such as intermittent colour blindness can actually be down to migraine & not M.E. as I've previously been led to believe - mine does come & go, but is always there to a lesser degree IYSWIM, can't offer much in the way of advice as regards drugs etc, as I just don't tolerate them well & therefore can't take any but basics, so wouldn't know if any can help with this particular symptom.
I did want to add though - just incase - have you heard of/looked into MDDS info here might be worth reading up on
Also - I don't yet know how relevant it is, but after YEARS of migraine & sinus problems & more recently recurring neck lymph gland infections - & all the scans & tests that go along with it - I had a flare up of the gland infection when I had my routine ENT check up - I mentioned it to my ENT Dr by way of excusing the fact I wasn't very together - he took a great interest & organised a more indepth CT scan that had previously been done
It showed up a tiny pocket of infection embedded in my jaw bone, a bit of root/nerve left over from a wisdom tooth extraction when I was only about 19/20 - he did say its not his area of expertise, but he feels sure that its actually the true source of a lot of my problems, including recurring sinus infections, headaches, vertigo & now these lymph gland flare ups - I've had it for over 20 years with no previous answers - I have a referral to another hospital dept for surgery to remove it - pretty hopeful it will be live changing, so it might be something worth baring in mind if you've had any dental work on the run up to your problems starting
Also I've found acupuncture can help a lot, as can MLD - good luck