Not able to maintain continuity in any task started!!

I'm like this all day everyday. I have so much I need to get done but never get around to doing. I try and set very small goals or set an alarm where I do 15 minutes of an activity in an attempt to get things done in small parts so its not overwhelming but even then I often fail to get things done.

Yep. This is me. I’ll wash clothes, but never fold it. If it’s folded, I won’t put it away. Even when I could finish a project, I suddenly get tired or distracted. I’m really self conscious about this now after I stayed with my cousin and she pointed it out. Every time I’d start doing things like cooking, or vacuuming, I’d get distracted and never finish. I think I do this for (at least) a couple of reasons. If it’s a simple task, finishing it means I’m free to start another one, and that scares me. I start second guessing as to what I “should do” next. If it’s complex, my OCD with perfectionism kicks in and that opens a big can of worms. I need to buy the right tools, research the project, make notes, etc. A few years back I was prescribed something that helped A LOT. I began to take it once more, but it hasn’t been as effective. if the reason is physical (medicine interaction, mold issue in home, etc) or emotional (current level of depression/anxiety, increase in ptsd triggers, etc). 

I feel like it's safe to say lots of people struggle with focus and motivation. You're not alone. My suggestions:

• Break your task into smaller chunks so it's more manageable.  Write them down or use an app. "Workout Monday, Wednesday, Friday this week" is specific. "Get fit for the summer" is too vague and broad. 
• Each day set specific goals for yourself using these small chunks. Don't set too many, just enough to keep you busy.
• Give yourself a reward for a job well done. A coffee, favorite snack, etc. 

I feel like training myself to get around this problem is the most important goal in my life. I am surprised lockdown hasn't helped with this but it has made MD worse.