I Have Be Constipated For 6 Days.have A Lot Of

I have be constipated for 6 days.have a lot of pain lots of burning in my colon .havethe urge to go but nothing happens.tried the finger up the butt .no luck ive had chronic constapatin for over 18 months.my dr hase tried differnat remides .nothing works.i would rather have a bag then to deal with this hope u can help.