Contipation. And bulkiness in stomach.

Its been uneasiness in the stomach from several days.  But earlier this was not problematic. Now from last three days its been more severe. I studied on net and found that it's constipation. The present Problems are:- i) It takes long time for excretion. Nearly half an hour or more and it is from years. ii) From 3-4 days after excretion in morning stomach doesn't feels empty. It feels as stool will come but it doesn't comes out. iii) After that stomach feels bulky. Little-little pain in stomach/intestine area. When gas is released then pain is reduced. This is continued for whole day. iv) Yesterday in evening I tried to excrete but excretion could not happened even after applying pressure. v) Then, consulted with medical store and took some medicine. It gave relief from pain and even gas formation also reduces and next morning excretion was 80% relieved but after 2-3 hours the problem started building and still feels like excretion but pressure is not building and bulkiness in stomach.