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Does it seem to happen more when the phone is in use or rings? The best thing to do is go around the house in every room and see if there is something plugged into a phone jack, If there is then you need to place a filter between that device and the wall. The device will plug into the side of the filter labeled phone if it is a filter with whats called a give back jack. The DSL modem itself is the only device that will not need a filter. If you have an alarm system that connects to the phone line(may be done outside) then you should contact your alarm company and inform them you have dsl and that it may need to be filtered. They can also do that outside.
If the DSL is having problems only when it storms then you may be getting water or moister in the phone box outside and causing it to short or something.
As to the ISP saying they can only help when its out is not entirely correct. Some can run tests to monitor the line. Also they should run a line test and see if everything comes back correctly or not. It may come back fine but if you get someone that believes there may be a problem on the ISP side then you could get them to put in a trouble ticket and get some monitoring/help done. In most cases like this is inproper filtering or something on the customers side however.
Like said above it could be a bad line but this would show bad signal when the ISP runs tests. Now it could be crossed lines which means your line and a neighbors lines could be crossed causeing their phone to disconnect your dsl. If your line has a lot of splices off of it or if its just an old line it could have a bad signal.
Hope something here helps you..
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