For over a year now I have been doing NG tube feeding and that has really helped to boost my weight. In the first five weeks I put on 4kg!
Some people don't like the idea of passing the tube but it really does get easier with practise and now I can pass it in about 10 seconds! I really would recommend it to you. I also have tried various supplements (Calshakes and Fortisip milkshake style drinks) but the NG feeding has really kept the weight on and I am the heaviest I have been for a couple of years.
What have you tried so far?