Perhaps it is simply low blood pressure, or actually you are still physically recovering. If you are feeling lightheaded you are probably pushing yourself too much.
For myself I did not feel 100% until 6 months after. In the beginning just getting up in the morning was exhausting. I think dialation was at it's worse about 2 months after surgery and took a lot of determination and and gritted teeth to get through a very long painful journey. It is different for everyone, but that is what it was like for me.
I still have discomfort with dialation after 3 years- but that is partly because I wait 2 weeks in-between.

I felt anxious too - anxious that everything was healing right, anxious that it would heal all beautiful, anxious because some of my stitches separated, anxious cause I could not sit long enough to work full time but had to anyway. More than likely you will be ok. You are doing all the right things, getting things checked out. Give yourself time to heal, 6 weeks is nothing!