Valproic Acid, Period side effects and pregnancy

Anyone else on Valproic Acid? I have a few questions about side effects etc. 

First let me start off by saying I have had Epilepsy for years. Since taking the medication I have so far been seizure free for about 7 years. I am a 28 year old female and have many side effects from the medications. Such as heart burn, diarrhea, depression on and off and a few other small ones. The main one though that I am writting this about is my on and off "monthly period". My boyfriend and I would like to have a kid eventually in the future and I am scared we may not be able to have a child. I rarely get my period and when I do it is maybe up to 3-4 times a year. When I speak to my doctor about it, all he says is things like "we can disguss it when the time comes" or "It is due to your medication". I cannot switch medications in fear I may have more seizures and I am allergic to Tegretol. 

My question to you, is does anyone have similar issues? Is there anyone who thought the same but ended up having good news in the end? I find myself crying far more then a 28 year old should over a future I am not even 100% about yet. I don't know much about getting pregnant etc other than the obvious, but I do know that I am scared for my future and I am already 28 years old. I want children :(