Weird head feelings and I'm FREAKING OUT!?!

I get these weird sensations in my head for the last 2 weeks!. I don't know what they could be!. I guess it could be allergies but it feels like my head is empty that is the best way to explain it, also it feels kinda cold in the back of my head!.!. What could it be!? Im also 21 weeks pregnant and have really bad anxiety!. Was diagnosed with generalized anxiety but never felt like this before until 2 weeks ago!. Please help me, I'm freaking out!. What could it be!? Should I see a neurologist am I going to faint!? I'm home alone my husband is at work!Www@Answer-Health@Com

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