Just wanted to say good on you Mick for reaching out and opening up a dialogue.
I started out drifting between type A and type C, but am now primarily a Warren Buffet style investor.
What you have described is extremely familiar, the anxious pit in my stomach as I watch pip by pip on a day trade.
I have found a lot of peace once I have become comfortable in the long term fundamentals of the stock, day to day fluctuations begin to mean less and less.
I spend way too much time on HC. Like way too much and check the Westpac app dozens of times a day. This doesn't impact my life though, but if you feel it is impacting yours, perhaps treat it like any other addiction and either go cold turkey or just try to cut down.
One method I use which helps me feel in control is constantly researching anything and everything relevant that is related to a stock on a daily basis and sharing it on HC for the benefit of others.
You'd be amazed at what you can find and it really helps you to feel in control of your Investment plan. Visibility helps to remove the anxiety you may feel.
If you're prone to depression or anxiety, definitely don't hesitate to seek help with it. There are plenty of options out there if you feel you need a bit of help to get your mental state on track.
I have all my eggs current in one basket much to the disgust of others but sleep like a baby. You just need to find what method works for you best.