I've had scrupulosity for many years and yes, what you discribed sounds like a scrupulosity or at least tendencies to scrupulosity.
About the Odin issue. You know that it is only a name which can be used even in our times. You don't consider Odin your god. You know it was only fictional character. You didn't name it that way and didnt choose it to worship the pagan god. Like, if you would have a friend with that name you wouldn't unfriend him for his name. If you would have doubts about it, just don't listen to them. Don't respond to them, ignore them. I know that I'm telling you. The more attention you will give them, the more they will bother you (it is psychological thing). Therefore, when they come, ignore them and put yourself in the loving presence of God. These thoughts will be coming to you, trying to bother you and take away your peace. Their purpose is most of all to take away your eyes from God so you would focus on this "maybe sin". When you would start feeling guilty for this, give it to God. Tell Him immediately how it bothers you and that you don't want to offend Him by using this system. Your goal is to give it fully to God and surrender to Him. Realize how much He loves you. He knows that you want to love Him too. Also, check your image of Him. Scrupulous people tend to see God as commander or a judge who is always watching them and waiting for when He will have oportunity to punish them. Live our religion as a close relationship between you and God.
Issue with confession is also very common. I struggle with this too. First of all, think for a moment if there is a reason for the feeling of bad confession. If yes talk about it with your confessor. In examining of conscience, I found it helpful to look at it like a relationship and ask myself: how did I offend/hurt God? How did I offend/hurt people around me? How did I hurt myself? Answers to these are the sins I tell in confession, plus I'll check it with list of the capital sins, with Ten Commandments and one or two official examinations to see if I didn't miss something. However, confession is sacrament so I don't feel competent to advise much about this. Find a confessor you fully trust, who would accept you. In next confession, feel free to tell him about your doubts and struggles. Don't be ashamed or hesitant about being honest about these things. In the recent confession it was for the first time when I came out openly with scrupulosity and all doubts and I was very nicely surprised. The confessor was very kind and reacted as if he already knew what it's like and gave me great advices and guidance.
Finding good and regular confessor is really most efficient thing you can do. Scrupulosity (if not stopped) leads to very bad and dangerous situations in spiritual life. The regular confessor will know you and your state and would guide you when your conscience won't work properly and after some time, he will guide you out of scrupulosity.
There is also the bulletin called Scrupulous Anonymous. Maybe it would give you bit of a help.
Also the numbness, as mentioned above, it is natural reaction to the break up. You can't just get over it. It needs time, but it will heal for sure. Give it to God. Talk to Him about this situation, ask Him for healing and also pray for your ex-girlfriend, if you'll be able to. It may help.
Gonna pray for you, man. Have blessed day and Merry Christmas!!!