My gums have got spongy and my teeth have so sensitive of anything cold / sweet !

My gums have got spongy and my teeth have so sensitive of anything cold / sweet / hot. What do I do?

The gums bleed while burshing in the morning.

I am going to say it is gingivitis that is causing your bleeding gums.Gingivitis is the inflammation or infection of the gums caused by buildup. There are two kinds of buildup, (#1) soft sticky plaque which turns into (#2) tartar that is hard like cement. If you haven't had a cleaning you should see a dentist or hygienist for a checkup, xrays (if needed) and a cleaning. During the cleaning the plaque and tartar will be removed. Although you can remove plaque at home by flossing and with brushing 2-3 times a day the tartar cannot be removed because it is too hard and often inaccessible. You must get rid of this infection or it can evolve into periodontal disease, which is when the bone surrounding your teeth begins to breakdown. This disease leads to chronic bad breath, cavities and eventually loss of teeth. Dental (mouth) health is directly related to a healthy body.
As for your sensitivity you may have some recession where the roots of your teeth are exposed due to hard brushing, tooth placement, periodontal (bone) disease or you may just be sensitive to the whitening or tartar control components of the tooth paste you are using. Try using only senstivite tooth toothpaste for a month and see if that does the trick. It plugs up the nooks and crannies on the root surfaces to reduce hot and cold sensitivity.
Good luck!
JAMRDH - a dental hygienist