Low energy and intrusive thoughts

There is not a discussion category on this website that truly describes what I'm dealing with, so I'm posting this question here because my issue might relate to autism, since I am on the spectrum.

For the past 7 years I have had low energy (to the point that I can't have a job) and thoughts that pop up in my mind constantly, 24/7 (these thoughts can be about a variety of things, and I can't control whether or not they appear in my mind.)

I don't know for sure what is causing these issues, but based on my research I think the most likely cause is hyperstimulation. (You can find info about it on anxietycentre.com.) Hyperstimulation is a condition in which the body is stuck in a stressed out state and it's usually caused by a person worrying way too much, but I highly doubt that's what caused it in my case. Instead, I figure that engaging in way too much electronic screen time as a kid is what ended up bringing this condition on. There are several factors that made my brain particularly sensitive to the stress caused by excessive screen use, such as autism, hence why I am posting this question in this support group category.

We have tried just about everything to get myself back to normal, such as an electronic fast, relaxation techniques, medication, change of diet, the list goes on. I followed the directions for recovery from hyperstimulation as found on anxietycentre.com, yet my symptoms still did not improve. The relaxation techniques often fail to make me feel relaxed, which is probably what my body needs.

Is anyone else here experiencing the same combination of symptoms that I am? And are there any suggestions for how I can return to the way I was before these symptoms showed up?