It is too much to put onto a baby the responsibility of keeping you free of anxiety, even if you are not actually telling them that you hope that will succeed. In time he/she will feel guilty about doing or being anything that might cause you stress and make you anxious again, and that could start him/her on course to become anxious themselves.
Fix your own problems for yourself (with help) and just enjoy the little mite when he/she arrives. It won't be a sudden recovery, but wanting to be more relaxed with your grandchild will encourage you to work towards it. Good wishes.
90th birthday mini hamper ideas!