hi Gus,
welcome to the forum & TSM

most people find that SE's wear off over the first few days/weeks. not taking the on an empty stomach helps - as you have been doing - but some people tolerate it better than others, although it does generally get better with time
drinking without taking Nal once you've started TSM is a real No-No, although it's not the end of the world, the brain unfortunately re-learns drinking without Nal rather faster than it un-learns with Nal, so you're going to set yourself back. try to plan to have a few pills with you at all times & have a decent stock in case of supply problems
there's no reason that you *have* to drink if you've taken a pill - if after taking one you decide you don't feel like drinking, then just don't, no big deal
I can't really comment on creative abilities as I'm not in that field. a few people find that Nal makes them feel a bit "flat" as natural endorphin highs - from food, exercise, sex, etc. - are blocked. however, conversely, if you have a Nal (& AL) -free day after taking Nal for a while, your opiod receptors will be up-regulated (ie more sensitive) so you may experience more of a natural high from those activities
all the best
-badger