high protein - side effects?

morning,

are there side effects to eating very low carb/high protein/fairly high fat?

i've been eating this way for the last few days and have had a bit of a shadow of a cluster headache so I'm wondering if its down to my diet or whether a cluster is just on its way again?

i had an episode of what i believe was cluster headache last year (family history of it) but didn't get to the drs while one was in progress so they aren't diagnosed but the symptoms were the same.

ok thank you, i'll give it a while and see if they go, although this isn't a headache as such, its pains every so often.