lightheaded-Trying not to Worry

I seem to only write in my journal when I am worried or stressed.  I did have a really good week this week.  I got to go to a friends house and work on a quilt I want to finish by Christmas.  So I was feeling good.  Then yesterday about mid-afternoon.  I started to feel jittery, for no reason, because I had eaten and I didn't have to much caffine.  But I tried to shake it off and ignore it and not let my anxiety take control.  And it worked I remained calm.  This evening though I feel off balance, kind of lightheaded.  I am not dizzy, but my head feels all light and just off.  I have also been having stomach issues, bloating, feeling full, and painful.         I know in my last journal I was complaining of lower abdominal pain which has actually been a lot better so maybe it was just my body trying to go back to normal after my son was born.  I am trying to not get all anxious and start worrying about brain tumors or some form of cancer, that is usually where I go from here.  I am trying to not go there instead I am trying to remain calm.  I have a doctors appointment in 2 weeks I am going to try to hold out until then.