Hi. My mom is 87 years old. She takes Lisinopril, Memantine and Donepezil. Today, she suddenly felt lightheaded and like she was going to collapse from weakness. I gave her an orange, then a bit of dinner. She isn't lightheaded, but says she feels weak everywhere. I also just noticed a small amount of yellowing in the outside corners of her eyes. Should I call her doctor, or take her to the ER? Or, can I just keep an eye on her to see if there is any change?