Don't fret my friend...
Not taking the Megafol 5 will not have changed your egg quality. Higher doses of folate can help prevent neural tube defects such as spina bifida. These only occur as the embryo develops.
It's great you are now on them, but a lot of foods are also fortified with Folate as well..so together with the .5 you were taking would have been ok.
I hope this can alleviate your stress a little now.
I know you are upset - and totally understand..but know that ....thank goodness...you have not been physically affected by the lack of results..