One of my character flaws is that I speak up when I should stay quiet--this is probably one of those times. Please take my words with my intent only to help.
I am not a physician; others here at this site are and can give you more valuable advice, I'm sure.
In my layman's opinion, you have reason to see your GP and seek answers to your symptoms, which are not normal! You must seek to resolve these problems especially for your young children.
Yes, the symptoms could be related to MS--but many other possibilities. Headaches with eye pain...maybe migraines? Warm, stiff, swollen knees...maybe rheumatoid arthritis? Menstrual period problems...maybe endometriosis, polycystic ovarian syndrome? These are in a family of diseases called "autoimmune diseases," as is MS. It is not uncommon for a person with one to be diagnosed with a second or even a third; many researchers think there is a common thread to them.
I, myself, was diagnosed with endometriosis; and 10 years later I got the diagnosis of MS.
The "ear problem" with the balance complication sounds like it might be sinusitis, which I have also.
Certainly your physician could rule out or help alleviate some of these conditions. MS is often a diagnosis by default--when everything is rule out--there is no definitive test for MS.
Perhaps a thorough exam and blood tests are a good place to start. I am this site's resident believer in excess insulin as the instigator of MS so I recommend a fasting serum insulin (not glucose) test. (My levels are elevated.) Others here will recommend other tests which are also good to detect possible deficiencies.
Start a file, keep copies of each test result, find a compassionate physician who is willing to work with you and answer questions without feeling threatened. Read, read, read; and don't hesitate to ask questions here--we are all on this same quest and we try to be supportive and helpful to each other. Welcome aboard, Eva. Good luck to you!
(And, see? I write much longer posts than you!!!)