A brain problem such as brain digeneration cn cause this.
A muscle disease can cause this.
Depression can cause this.
You need a comprehensive workup as there are other causes as well.
Difficulty getting out of a chair is classic for polymyositis, a muscle disease.
See an internal medicine doctor as soon as you can.
You have to consider TIAs as well, mini strokes.
In this case I suggest you go to the ER.
OK, so you might have more questions or want to give me more information: Please use reply to expert if you have further questions. Also, please click a positive rating [hopefully excellent—that’s how we are paid, per rating]. If you forgot something, come back. I am here http://www.justanswer.com/medical/expert-dr-thomas/