I am going through the diagnosis stage as well. My family has strong history for celiac disease, and while I always had discomfort and other symptoms ( some of which i didnt know about) I wasn't tested until recently because I was DEATHLY afraid of needles. The results are highly positive but I am still getting a biopsy in early August. From what I have learned about it is that the endoscopy is beneficial to looking for not only signs of celiac but also other diseases that have similar symptoms to celiac. Because of your mixed result it wouldn't hurt to get a biopsy but it really is personal preference. I understand what you are going through and didn't like the idea much either but I really think it is something that can help you in the long run.
P.S. There are lots of testing being done for new medications or other ways to "cure" celiac other than a gluten-free diet. It is my understanding that this can only be covered by insurance with a confirmed diagnosis (biopsy) but I don't need to get into that. The bottom line is that a biopsy is confirmatory especially since the doctors could see in the intestine, so to me, I feel better knowing that there's no chance of going gluten-free for nothing.