hi... i dont think minimizing his problems or downplaying anything he says will make him feel any better. dont cut him off from your life; he is your brother...he is obviously very insecure and cutting him off may be a really bad idea. just explain to him that though you may be the person in his life who knows him best, you are NOT an expert. explain that you care about him a lot and that you understand what he is saying, but that you do not know how to alleviate his problems. tell him to consider seeing a psychotherapist because you feel he would benefit more from that than from talking to you (even though it may not be true. the reason for this is that you want to empower him). tell him you had had to see someone once (if it is the truth, go with it, if it's not, make sure it's realistic) and tell him how much it helps to talk to someone who can really help him.
he may say that a psychotherapist would only be listening to him because they are being paid for it but assure him that regardless of whether or not thats the case, it does help and that he will be given tools to help himself rationalize out of his insecurities. he may dismiss the therapist idea because he/she wont know him like you do. but you need to reiterate that you are an expert on YOUR life, not his, and that with the help of a therapist he can learn to become an expert on his own life.
I really feel that the only way to unburden yourself is to have him talk to someone. it will really help you both, and he will be communicating with someone while not weighing you down. just an idea. good luck!
