Try and sort it as soon as you can hun.... Someone else on LT had to stop for a while as they couldn't poo, and ended up with the start of a prolapsed bowel!!
If you get the psyllium from Ebay the company is called "thespiceworksteam".. They also have a website, but it is cheaper from Ebay........ I ordered 500g (which turned out to be quite a lot) and i have had to adjust the amount to get me settled, but i now take 1 heaped teaspoon every other day..
I had the same problem as yourself and in the end I took 5 dulcolax and 2 extra strong senocott and I went it was such a relief It i s over the prescribed dosage but I just had to go after that I take 3 or 4 dulcolax pearls every couple of days and I have been fine
You need to work out what type of constipation you have. If you have stool ready to pass, but it is too large and hard to pass, then adding fibre is the wrong approach. You need a softener like lactulose, which pulls water into the lower bowel. Only after you have cleared out what you already can't pass should you consider how to avoid it in the future - which may well be additional fibre to speed up the passage.