I'm sorry I'm confused. You know hell exists, then surely heaven must exist too. If the devil resides in hell then God resides in heaven. Yet you say you hate God. This just doesn't make logical sense. You sound like your in a awfully vulnerable position, which can leave you open for demonic attack. Please don't blame God for your loss and suffering. Maybe God wants to help you if you can just allow and stop hating him. I know it's very easy to blame God, but there is so much we dont know. Surely after seeing hell, you are aware that there is much we don't see in our human state, much we don't know. My parents and many people since have used God, karma, religion etc etc as a form of punishment. If I wasnt good then God or whoever, would punish me, yet when I was good, God would still punish me, while he favoured and blessed those that appeared to be bad. So I was worse than bad...I was terrible, a miserable horrible, shameful soul that didnt deserve to live... and I hated God... and I learnt to accept and embrace my badness....but it all left me open to demonic attack. Yet I've come to know that God is the only one that has power over the devil and he and his angels are the only ones that have the power to stop the devil and demonic attacks... therefore its impossible to hate God. Instead I'm grateful and give all praise to Him for that. Infact it's the only thing I have to be grateful for.
I'm not sure how you could distinguish such hallucinations from a demonic attack. You either see it from a medical point of view or from a spiritual one.... or perhaps both. Either way It's still very real to the person experiencing it.