Brain fog/issues - peri-menopause symptoms

Hey ladies

I used to think that I was pretty smart in all aspects of my life. I made the right decisions in work, home life, money situations and lived happily. When my children were smaller, I seemed like I had it all together and now that they are older (I only have a 17 year old living at home now) I just feel lost. When I should be enjoying myself at this stage of life, I am not (I am 49 years old). Over the last few years, I have found that I am not as smart as I used to think I once was. I just noticed that people have better ideas, understand things better than me and can make great decisions for themselves. I have also been going through peri menopause symptoms and wondered if these two are connected. I just can't think and I have no energy to do anything, I can't seem to get excited about anything either. I have brain fog, procrastinate all the time, I'm not happy in any aspects of my life because of this. I have put on weight and no have friends and find it really hard now to make any. I tend not to join in situations like I used to and when I do I am quiet, not my usual happy go lucky self...has anyone else experienced this? What have people tried that seemed to help...I feel lost and I want the old me back.