What Could Be Causing Fatigue, Forgetfulness, Blurry Vision, Hairloss After Pituitary Tumor Removal?

I m 28 year old female 5 3 110lbs. I was diagnosed with a 5mm pituitary tumor about 4 1/2yrs ago. Had it rescanned in 2009 and they said that the tumor was gone. Well since November I have been experiencing fatigue, and within the last few weeks the fatigue has increased to a level that I have never experienced, along wiith feeling very foggy and forgetful. I noticed yesterday that I feel like my vision is kinda blurry when I look from a distance, I almost feel kind of drunk, if that makes sence. Also my hair is breaking off all over in very large sections.. I am a hairstylist and know from my knowledge that nothing I m doing in my daily hair care routine should be breaking my hair like this. I have not colored my hair in a few months either. I am going to have my thyroid checked in a few days, but is there any chance that my past history with pitutary tumor could have anything to do with this? I had an open MRI on my last scan, if that makes a difference.