The key, very simply, is for you not to depend on your feelings, but to depend instead on God's facts -- the fact of His love for you; the fact of His unchanging promises; the fact of His constant presence.
After all, emotions come and go; one day we feel strongly about something, and the next day those feelings have faded. But God's truth never changes -- it is the same yesterday, today and forever, and it alone provides us with the solid foundation we need for our lives.
Where do we find God's unchanging truth? We find it in His Word, the Bible. The Bible is a gift from God, given to us to tell us about His love. It also warns us about evil and the wrong paths we might be tempted to take, and shows us instead how we should live. Most of all, it points us to Jesus Christ, who came to save us from our sins and offer us eternal life. The Bible says, "Your word is a lamp to my feet and a light for my path" (Psalm 119:105).
Make the Bible part of your life every day. Read it ... study it ... meditate on it ... memorize it ... believe it ... obey it ... share it. Remember Jesus' promise: "Everyone who hears these words of mine and puts them into practice is like a wise man who built his house on the rock. The rain came ... yet it did not fall, because it had its foundation on the rock" (Matthew 7:24-25).