Can I temporarily up my dose to 80mg?

Hi all. I've been on omeprazole for as long as I can remember (probably like 5 years now?) I'm 17. I have really bad acid reflux, to which in the process of elimination I found I am lactose intolerent (this is irrelevent here however). So I've been perhaps a week without it because I forgot to order some.I've just taken it today (40MG) but I still feel really sick with it and my throat is burning (I'm very used to what is normal/not with this medication) Would I be able to up it to 80mg just for today? I accidently did that before and the doctor said I'd feel better! It was not an intentional OD. 

Thanks all

Ofcourse you can, but conulst your doctor. Have you had any side effects from them this 5 years..

As far as I remember, I haven't had any side effects. Thanks for your reply. I took an additional 20mg and felt better.

Well, thank you for the reply. Hope you will feel better in the long run, adjust your dosage, my doc always tell me to up the dosages if I have symptoms on low dosages and then lower the dosage once it gets better.