Just a word of caution. All of these suggestions regarding constipation and blockages are accurate and possible causes of your problem, but I would be very careful about following any extreme cleansing protocol without medical guidance.
I am aware that present circumstances make that difficult, so possibly on your own you could start slowly, as Meirish suggested, and maybe increase fluids, use a gentle stool softener, and adjust your diet in any way that, for you, has helped regulate your bowels.
Certain pain medications, like those containing codeine or other opiates, can be constipating, and lack of regular, even very light, exercise can also play a factor.