First thing I noticed is that your sketch is not constrained.
Place (dimensioned) symmetrical sketch points and then create your spline.
The vertical line on the left side isn't, well, vertical.
There is a very very very very sharp point midway at top. Nothing can be manufactured with a sharp point like that.
On the other side the point isn't evey symmetrical and loops over itself.
I recommend you read this http://home.pct.edu/~jmather/skillsusa%20universit
then perhaps do the Vacuum tutorial in my signature before you start your part over.
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