I started using NuvaRing last year in June. I have two girls ag...

I started using NuvaRing last year in June. I have two girls age 5 and 3. I am 34 years old and dont want any children. The NuvaRing is actually my first time using birth control. My period was normal and no weight gain. But I notice that I am very moody, tired and very forgetful. I would black out for 5 seconds. My sex drive is normal. I should remove the ring this friday but starting last week I started to have brown spotting and feeling cramps. I am still cramping and spotting but not bleeding. Does anyone know what is wrong? I called the doctors office and they said I maybe going under a lot of stress and probably due to my age. I started my new job and I am under alot of stress. I work full-time and I take care of my kids after work. Can anyone tell me if this is normal?