I have a Meyer Lemon Tree I bought about a month ago. It was all happy and healthy when I bought it. BUT it is now losing leaves at a steady rate. I have watered it when it is dry about 3 inchs down in the soil. It is sitting in front of a great window. It gets wonderful light all day, and at night I slide it over so that it won't get cold drafts. I have not fertilized it yet. It is full of blooms ( dozens and dozens). They are not dropping yet. It had 2 huge lemons on it. I have already picked one. The other is not ready quite yet. Help, what am I doing wrong?