My azalea looks absolutely shattered. It is in a pot which was waterlogged during the winter. Despite the fact that I have fed it, the leaves are small and some are orange. The flower buds have failed to blossom. I'm afraid I may have killed it by keeping it in a pot. It usually flowers, but not this year. I may give up on it and root it out, but should I wait a bit longer to see if it picks up.
The buds may not have formed properly last year because of the hot dry weather. It's been a common problem this year for lots of rhodies/azaleas/camellias as the buds start forming in late summer, and many areas were suffering very hot, dry conditions.
It can be much harder keeping shrubs in pots, as it's often a fine balance between too wet and too dry.
I live in west central Scotland - not where that photo is...
I would do as others have said but also turn it out of the pot and inspect the roots. If they are OK then repot it with some fresh ericaceous compost and then prune it down to a third, taking all the damaged parts out. Give it a good feed and maybe it will recover for next year.