imhapyru: if you have tried all the usual remedies and they haven't stopped you may need to actually go see a doctor to try medication. Believe it or not this isn't really all that uncommon I have known people who had hiccups for weeks and had to try several different meds to get them to stop,
Step 1: Exhale Completely Right after a hiccup, smoothly exhale all the air out of your lungs. Step 2: Take A Deep Breath Breathe in all the air your lungs will hold. You can inhale through your mouth or nose, whichever you prefer. Step 3: Hold Your Breath Hold that deep breath as long as you possibly can. It helps if you swallow a few times during this step. Step 4: Exhale and Breathe Normally Hopefully you are now hiccup free again. If not, move on to step #5. Step 5: Repeat As Needed Sometimes it works the first try but I've found that it normally takes 2 repetitions to get rid of my hiccups. Occasionally more.
If you hiccup during step 3, you'll probably have to repeat.