Obsessed with running out of things

Since I moved out and got married, I've noticed my dad seems to have some problems. It started off little and know it is out of control. He goes to stores daily buying very large quantities of items because he is afraid he will run out. He now is thinking of building a concrete slab with a large generator to power his house because he thinks that our power companies are changing and he is afraid we will be part of a rolling blackout. Every time I go to his house, his cabinets are overflowing with items he does not need, but just in case he needs them they are there. He worries about things that we all worry about, but it consumes his life and is draining him financially. His house looks like a Walmart warehouse. When you talk to him you would never know there is a problem by everyday conversation, but my dad's problem is only growing worse in time. The neighbors are starting to notice all the boxes on the curbs of the things that he buys. He takes medicine for anxiety and depression, but whatever he has these medicines don't control this problem. He knows there is something wrong with him but I'm afraid he will be misdiagnosed if I take him for help. What is wrong. Help

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