Hi @Missyme
A warm welcome to SANE. Sorry to read that you are feeling so drained. One thing I know for sure is that "constant worry" zaps all the joy from life. Zaps life itself. From what I read you are in a vicious cycle in that regard. This can also create untold anxiety and mental health disorders if chronic enough. It shuts out all the positives and is draining. That has been my experience.
What can help to shut off the worry cycle is to keep your mind and body active - distract, distract, distract. Do you find you have too much time on your hands to think/dwell on problems or perceived things that can go wrong? Gently move your thoughts to something more positive and put your full focus on those things. I have to work on this constantly myself and it does help.
Also not dwelling on the past or worrying too far into the future - it's doing our best each day then letting tomorrow take care of itself. Leave it in the laps of the Gods. Resigning to what we can't change and making the most of life and our lot. When a problem arises worry then and only then - and look for solutions not worry. Worry does not change a thing I have found but can create problems that aren't even there or of any major concern.
Our minds can be our worst enemies - it's time to take back control of it and gain some peace of mind, passion, contentment and purpose. Constant worry that overwhelms robs us of the latter and can effect us mentally and physically.
It sounds like you have had many different diagnosis's that are conflicting. As a clinical psychologist explained to me in the past; such labelling/diagnosis of mental illness is the medical professional assessing a collective group of mental/psychological symptoms placing them under a categorised mental health illness in the aid to assist them to prescribe effective treatment for the patient; and this is not always full proof as you are finding - and diagnosis can change as symptoms change.
Everyone is different and it's hard to place all the answers in a box. It's just a guide. Some like a diagnosis where others do not for the latter reasons. Depression is usually a combination of ills which can stem from both psychological, mental (brain/body chemical imbalances), emotional, self esteem and physical causes. Having a full medical/blood tests etc for illnesses/deficiencies/imbalances/disorders that can cause anxiety/depression/fatigue etc is important to rule out any underlying physical causes.
Have you ever had help (such as cognitive therapy) to help address your worrying/negative thoughts? If not perhaps that is why nothing has worked thus far? My daughter was once diagnosed with Borderline Personality Disorder (has since improved), and the first line of treatment is psychological counselling/therapy. Her treating psychiatrists said medication is largely ineffective for this set of symptoms/disorder. Her problems stemmed from bullying, sexual assault when out of our care and mainly low self esteem - worrying over everything.
Once you let your mind relax it can grow - and it gives it a chance to focus on the good things which worry detracts from as it puts it focus on the negative. When your mind starts to become free from worry then you will start to feel the joy in living.