Hi
Huey123 and welcome to the RT. You are asking questions that I imagine many people have.
First, the caveat. We are not physicians, and if you feel you are having a medical issue, then take the appropriate steps.
I hear people speak of these feelings quite often (well before we were at home during the virus time). There are a few things to do to help calm yourself. I'll start with the physical things.
First, drink plenty of water. I know everyone and their cat says this, but it is true. It can become a downward spiral - don't drink so much one day, feel crummy, and drink even less. It sets up the perfect storm of internal imbalance, which gets more easily out of whack as we age.
Eat the best and most balanced foods you can (again, the virus thing complicates this but do the best you can). If you rely on processed, high sugar, or fast foods, your body will complain in one way or another.
Go outside, get some sunlight, and walk barefoot (weather permitting). I've read about athletes using this technique (walking barefoot on the ground). When I do this, I can feel the energy flowing through my legs into the earth - like releasing an overload.
Find ways to calm the mind. I know my mind can go miles in a minute, and if I need to sleep, it seems to get worse. I did discover that a cup of holy basil tea with rose has an excellent calming effect. There are different blends, but the one with rose seems to do it for me. Another thing is the electronics in the sleeping area. Because I have family that relies on me, I don't turn off my cell phone at night. However, I do have it as far away from me as possible (but still can hear it). We do have a tv in the bedroom, but it and the cable box are plugged into a power strip, which I turn off at night. This one thing makes a huge difference for me.
Not sure about whether or not you meditate, but that goes a long ways to calming the mind. There are pinned posts on the Consciousness Exploration Board with loads of good info. If you are looking for a quick start, consider a guided meditation. We are fortunate to have a great source with one of our members, Brad. Here is a link to some of his meditations.
https://www.transients.info/roundtable/threads/guided-meditations-binurial-beats-background-sounds-mantras.7491/#post-53179
Ok, I think I've gone through some of the main issues that we can address on the physical side. I'll come back in a bit and share more about the rest of it, but here is a teaser - no, you are not going nuts.