Early-onset Alzheimer's or something else? (20 year old)?

I'm a 20 year old with severe anxiety and depression. I don't do drugs, I always get enough sleep everyday and eating properly. Alzheimer's doesn't run in our family in both my mother's and father's side. I even double checked it with the help of my grandma. All of my granparents didn't develop any kind of dementia and has a very long lifespan. They can live past 85. In the past 2 weeks, I keep forgetting things in seconds. It happens more frequent now. I'm also losing interest in life recently. This morning when I woke up, my brain isn't thinking. It's like my brain is frozen. I don't know what to next. I've lost my initiative which is totally abnormal. I was so scared my anxiety went out of control. It lasted for about 10 minutes. Right now mind my has stabilized somehow. I really feel like my memory is deteriorating and it come and goes. Does this sound like Early-onset Alzheimer's? Anxiety? or something more serious? or am I just paranoid? Should I go to the ER now? I'm really scared of this. I'm too young too die please help :'(