If you have wholeheartedly confessed Jesus as Lord, and have believed with your heart that God raised Him form the dead, then you are saved and born again. You are then sealed with the Holy Spirit. You cannot be born again and then disowned. Under Jewish family law a natural born son can be disowned and lose their inheritance, but an adopted son cannot be disowned and lose their inheritance. The only way you can lose your inheritance is by consciously rejecting it. And that would only be accepted after you "knew" what your full inheritance was all about, and the power you experienced because of your inheritance. The Father would not let His son lose his inheritance if the son did not fully understand what his inheritance was about.
So get over the idea that the Holy Spirit has "left you". He is right there inside you, along with the Son and the Father. They are living within you now, and with you, all the time. If you want to experience the power of the Holy Spirit then ask for the baptism of the Holy Spirit. The apostles were already saved when they were gathered in the upper room. That means they had the Holy Spirit within them. But Jesus had told them to wait to be baptized with the Holy Spirit and with power. That is what happened when the tongues of fire descended on them on Pentecost in the upper room. They began to speak with tongues and were able to preach with power and do sings and wonders.
In the name of Jesus, I bless you with the life of God.