I am practicing singing in a metal Robert Plant way, since its allergy season; the allergies mess up my voice in metal tone and I can't tell when to put rasp in.

Usually the only way I could sing in a metal way with rasp and stuff is really low, I had tried singing high then putting power into it and I did succeed but I was out of breath and I only managed a few words.

When I sing high and put power in my allergies don't get in the way. It would sound better if I could hold out the power and tone without it dropping.

So if anyone can help me just reply if you know anything

drink lots of orange juice