Gps can be helpful in prescribing psychiatric medications but they generally aren't as knowledgeable about them as someone who specializes in them. It might be a good idea to see what your options are as far as insurance goes and find a psychiatrist (or often it's a nurse practitioner which has sometimes been even better for me) to ask about your concerns.

Medications are also really individual in how they react to each person. One will give you tons of side effects and another might give you none at all or so minimal that you barely notice them. In the same way, one will work great for you and others will not.

You might have ADHD or you might just be depressed. Lack of motivation, procrastinating, difficulty staying focused, not feeling like socializing, and losing interest in things you enjoy can be symptoms. Only a doctor or therapist can really help you work out which though. My brother has ADHD and he does the hyperfocused obsessiveness and losing interest thing with a steady string of new hobbies and interests. I do a version of that too but mine is from major depression which is why an expert opinion is a good thing.

You certainly have a reason for the depression if you're still dealing with losing a long term partner (and the situation that led to the breakup) and the resulting loneliness. Even stress from all the traveling and running your own company could be wearing you down and contributing to your issues. You probably already know that benzodiazepines can contribute to depression.

In my experience, it's not at all uncommon for a person with one mental or emotional issue to have another (or many others) as well. You're absolutely not alone in that. I personally have a bunch of them.