Omnicef and lower abdomen

I was diagnosed with severe sinusitis a week ago, and my doctor prescribed omnicef for me since I was allergic to PENICILLIN. After the first day on Omnicef, I felt fine, perhaps a little better. As days continued to pass, however, I began to get some horrible reactions. They started out mild, and now (after taking it for the seventh day) I have major tongue and gland swelling in addition to a horrible headache and weakness. I've felt close to fainting several times throughout the past several days. I went through a random bout of depression a couple days ago, too, and there was no reason why. I feel more irritable, but I've been attempting to control it. I haven't lashed out wrongly at my loved ones yet, but I've come pretty close. I have some pain in my lower abdomen (where the intestines are located) as well, but only when I walk in a quick manner. No diarrhea, yet, but I think that's because I normally have digestion problems (constipation). Some of the joints in my hands are acting funny. They aren't as strong as usual, and they've been going numb/cold more often, causing their movements to be a little slower/stalled.

I'm seventeen, and when my mom contacted the doctor yesterday, the doctor said that "these aren't allergies/side effects" of this medication, and that I need to continue taking them. So I took them again yesterday (the seventh day), and that's when the swelling of the tongue and glands in my throat took place. When my mom called today and notified the doctor of that issue, the doctor said that..oh, how was that worded... That "it's the first time I've had this reaction" (while on this medication), and that it isn't caused by that medication but from something else. I'm sorry, but I'm not taking any other medications, and I haven't eaten anything strange/new that would cause me these difficulties. It's definitely the medication.

I'm done with this medication. After doing research on it this morning, I've learned that at least ten percent of those allergic to penicillin is also allergic to omnicef, and I'm allergic to penicillin. Why my doctor is being so stubborn about these reactions, I don't know. I guess this is just an example of a doctor who isn't well-educated and sticks ONLY to the side-effects/allergic reactions listed on the prescription bottle. If problems persist, my mom will take me to another doctor. For now, I'm going to stick to the Neti pod and nasal spray to try to rid me of my sinusitis. Maybe it'll work out alright and my problems from this medication will go away quickly. I'm sick of being sick all summer.