Hibiscus turning Yellow- HELP!!!!!

Just received a Hibiscus for Mothers Day. Big beautiful yellow flowers. Live in AZ and its been in the upper 90s and 100s. Now the leaves are turning yellow, the big buds aren't opening and the smaller buds are falling off. Its in a large pot, I've watered it thoroughly. I would rather not plant it in the ground if I don't have to. I looked up "hibiscus" and it seems that all this stuff can happen to a hibiscus if it "gets too much water", "too little water", "too much sun", "not enough sun". How do I know which one I'm doing to make it look like it does? HELP!!!!!

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