Yes, ms can cause headaches due to nerve receptors & other things.

A headache with nausea is almost always a migraine. You should speak with any of your docs about a migraine pill. Not all migraine meds work for every patient so just because 1 doesn't help, another might. I really would begin with that.

Notice if the headache comes after some common triggers such as:
processed foods
red wine
alcohol
chocolate
caffeinated beverages
noxious odors
MSG

As far as home care on your own - heat on the back of the neck is for tension headaches. Ice pack for migraine (wherever it seems to help on the head or neck). Caffeine is in most migraine meds so you can drink some strong coffee. And, of course, a pain reliever. Take whatever works best for you - aspirin, tylenol, aleve, etc.

Question - does the headache go away if you fall asleep? That too is often the case with migraines.

So you have gotten a lot of good answers. I deal with all sorts of headaches/ pain. Half the time it’s accompanied with nausea. But I also have ibs. My doc once said who cares what caused it (MS, etc) just treat it.
Yes stress is evil !!!!

Yes, I believe MS Definitely can cause headaches! Trigeminal nerve. Bad headaches can cause nausea. I have a Trigeminal Neuralgia plus atypical facial pains from MS.

@SusanLangleySi the occupational therapist that came to do the evaluation on my daughter suggested it. You are quite welcome! I try to share the good stuff i learn!!!