Because we are all one, to give to myself is to give to others and to give to others is to give to myself. Therefore, we can have less fear about being selfish in caring for ourselves - or feeling drained in giving to others.
Also, I have made a lot of progress in accepting gifts from others in a gracious, appreciative way instead of feeling embarrassed and unworthy. I have been working on taking better care of myself - giving myself gifts - but I realize I can accept those gifts with more open-hearted appreciation.