Baby help!

My 7 month old has been sick on and off lately... His nose is congested and he has mucous on his eyes and he's always crying when I touch his ear.. I've taken him to the doctors and they keep insisting he's fine.. But it pains me to see him like that, I just wish I could take it all away! I've tried saline drops, vapor, and it doesn't help.. Any one have any suggestions??