I had stopped taking the dig for 3 days then resumed it, haven't had any reoccurance of symptoms yet. my dig level was low after not taking it
I have been through Digitalis and Digoxin toxicity. The classic sign of toxicity is seeing 'cracked walls'. I too had the upset stomach and vomiting, but it did not take very long for that to happen to me; I never lasted anywhere near 5 weeks. I would question if something else is going on with that. The other symptoms you describe can also happen as a result of the lower HR and BP.
There's not enough information in your post, e.g., rest HR and BP to reach any real conclusions. I also do not know anything specific about Digoxin, but understand it is, or acts similarly to, a beta blocker. If that is the case, it likely lowers you BP which could cause both dizziness and fatigue.
It has been my experience with BB, that it takes months to adjust. I take Metoprolol to lower my HR which is driven by AFib. It helps, and in the beginning gave me a case of too low BP, but that has mostly gone away... my BP is now near normal, again. I am not sure if I feel any more energetic, but I do not have dizzy spells.