Of course it "seems stressed" :-) It looks like it's dying. I would say your poor Meyer lemon is suffering from severe transplant shock, and this shouldn't be surprising, as you've mentioned that it has been through "several transplants", as in more than a couple. Frankly, I'm surprised it's still alive. I would be sure to water appropriately, and continue to fertilize carefully. Be sure you fertilize with the appropriate amount of citrus fertilizer, but make sure you've watered, first, put down your product, then water it in. With this poor little tree, you would want to make sure you don't put down fertilizer when the tree is dry. Don't worry about any suckers for now, most likely it isn't a sucker, but was simply a water sprout. If you can see where the graft line is on the trunk (be sure you haven't buried it in this last transplant effort), all branches should be emanating from above the graft line (the scion, in your case, Improved Meyer lemon). If you can't find the graft line it may mean this tree is a seedling on its own roots, which is not uncommon for a Meyer lemon. The blossoming you're seeing is most likely a combination of being the time of year for citrus to bloom, as well as a tree that is extremely stressed, sensing its ultimate demise, and trying to fruit before it dies. So, let's see if you can revive this poor tree. Don't move it, again. It won't make it. Water, fertilize and patience are in order at this point. Patty S.

Ah, leafminers. Wouldn't have guessed that. Looked like it was slime on the leaf when I was looking at the pics on my phone. Rodney

This is citrus leafminer. You can search this forum for remedies.

Looks like spider mites; if you have a 10X loupe, look on the underside of the leaves for the mites and their tiny webs. Lots of ways to treat them; just do a search here (top right box of this page) for spider mites and you will find lots of advice.