Fifty, I mean this with all the niceness I can muster, if you are feeling that ill, is now the exact second to be experimenting right now? I know you spent money and invested a lot of time, but I have found that a) when I am that ill, I don't always do my "best work" as it were, and make errors I otherwise wouldn't and b) I don't taste/sense things well when I am sick. I don't want you to skip over what might be YOUR best build because you feel awful, are coughing, and not smelling and tasting well.
Maybe let all this information just stew in your brain for a while, and come back to it when you are feeling better? It also kind of makes sense (being sick) why you got upset/lost patience.
Really, you have your equipment and you have known builds you enjoy on a regulated mod. Just do THAT until you feel better. I know it's annoying, and I have setups I have put aside for various reasons (including frustration, like the Doggystyle, which everyone loves but I have the WORST time with and I really want to vape it). I always have the opportunity to go back to it when I'm ready, you know?
Setting up a mech and finding a great vape, you really want to be at your best for that.
I agree with everyone about just building "safe" builds then testing them on your mech (and also a single coil RDA, you can get a good if not Great clone for about $13 or less, probably) to test out your builds without the distraction of dual coil.
It has been said repeatedly that dual coils don't shine on a single battery mod, I would start thinking about that, because I think your frustration is coming from a LOT of things, including the complication of a dual build on your first mech. Heck, I find dual builds difficult, period. I am more MTL than you, but you can achieve a good, even great result with a single coil and the right build on that deck, probably a better build than you will get initially with a dual build (which is also a WHOLE LOT more work for testing builds.)
I sincerely hope you feel better, and my advice would be right now to take care of your health, not worry about your mech.
Anna