He could have send He was sending a healer, provider, a peace maker or a way maker. God certainly does all of those things through the work of Holy Spirit here on earth. But Jesus chose instead to refer to Holy Spirit as comforter, teacher and guide in John 14-15. The fact that Jesus started John 14 with do not let your heart be troubled and then repeated it again in verse 27 of the same chapter indicates there would probably be some things arise in the apostle's lives that would be unsettling or troublesome.
Jesus indicates that Holy Spirit will teach us and guide us into all truth. But He called Him the comforter for a reason. (He never wastes anything!) Life can be unsettling, the life of a caregiver can stay that way! Those of us who are breathing (caregiver or not) experience life altering situations. Many things happen along the journey that we didn't expect. It may be illness, car wrecks, the loss of a child or any number of things that we really didn't foresee as part of the way things were going to work out...Jesus knew...
He knew that on this journey of life some of these huge things would attempt to disrupt our vision of God. Holy Spirit is sent to us to empower us to always keep God in view. No matter what life throws at us, no matter what comes up (or goes down) in a day's time - He is the constant comforter who is always explaining the Father and His love to us.
You know what the cool thing is? Jesus said that Holy Spirit will be with us forever. That is a concept that is difficult to grasp. Everything we know and experience has a beginning and an ending. But the presence of Holy Spirit in our lives has no end. He has made His abode in us and is there to stay. I think this is one of the most comforting things to me. He doesn't ever look at a situation and say, "Oh no!" Or "I didn't see that coming!" He is calmly residing in us to help us work through every situation that presents itself to us. He is here forever. He is not going away because we got angry with God or His plan. He doesn't tuck and run when those situations become more complicated. He is the only constant in our lives.
Today let us rejoice in the ever-abiding presence of the Holy Spirit. Embrace His comforting touch today.