Just giving another update... I was referred to rheumatology, and they suspect that I may also be dealing with fibromyalgia (it has not been formally diagnosed, but just suggested at this point). So, I am continuing with the anti-inflammatory diet and vitamins and still working to keep getting rid of all these hidden gluten sources, but I also do have another possible explanation for some of the issues that I'm dealing with.
I would pressure the lab to do the IgA control test for free so that you won't write a poor review about their testing services. You could get this done at any time, whether or not you are gluten-free, however, the celiac disease Tissue Transglutaminase tTG-IgA test must be done after you've been eating lots of gluten for around 6 weeks. This way you could salvage the results of your tTG-IgA test, as long as you were eating lots of gluten beforehand.
Given your strong reactions it would be wise not to eat things offered to you without reading the ingredient labels. It's possible there was indeed gluten or some allergen in the chocolates--barley malt is a common ingredient in some chocolates.
Yes, an IgG panel is the logical next step. However, you would still need to be consuming normal amounts of gluten to ensure valid IgG testing. Since it has only been a week that you have been off gluten, there is still likely time to restore antibodies to detectable levels before the blood draw. IgG antibody tests are not quite as specific for celiac disease as are the IGA tests but they are certainly valuable in the case of IGA deficiency. They also seem to have a little more "staying power" in the sense of detecting celiac disease in the case of those who may have already started a gluten-free diet as long as they haven't been on it for an extended period of time. But don't rely on that. Get back on gluten if you can possibly endure it if you intend to go forward with IgG testing.
This might be helpful: