Hi OP, sounds like things are really tough right now, and I'm sorry you're feeling judged and unsupported by the professional with the word support in their job title.
It does sound like you have an alcohol dependency. I wonder if there is a local drug and alcohol service near you that you could talk to about what alcohol dependency is, and what it means to you?
If you've been drinking daily for a long time your body will need a certain amount of alcohol for you to not enter withdrawal. You can't stop drinking completely immediately, this is really dangerous and you could become very unwell. Drink just enough, at what is a maintenance level, to stop withdrawal symptoms, such as sweating, shaking, palpitations etc.
You need the psychological support from someone experienced in addiction as this is often harder to manage and change than the physical need. Alcohol is an unhelpful friend that lulls you into thinking it can help you. It can't, as another poster said, it is a depressant and will make you feel worse. Please seek support from AA, but also professional and medical advice and look at a reduction plan.
I'm a CP social worker and no way would I consider removing what sounds like a teen from you, unless there is significant impact on him that can be evidenced. I would look at a network safety plan for him. Who can step in and care for him if you want to get intoxicated? Who are the safe and sober adults in your network that he can call if he needs help? I'd increase his understanding of addiction to ease his worries about what might be going on, rather than letting his imagination run to catastrophic thinking. Believe me, he knows you drink to excess and will have worries. But, age appropriate honesty and education will help him feel better.
The fact that you have a FSW suggests you want help which is a large part of your battle. Suggest that they refer to Social Care for a s.17 assessment to be completed of your child's needs. This needs to be with your consent. The only way Social Care can override your consent is under s.47 enquiries, which means professionals which will include social workers, police, education, health at a minimum, plus others such as your FSW feel the threshold to evidence significant harm is met. These enquiries may, or may not, result in a child protection conference being held and multi agency discussions and decisions made if he needs a child protection plan.
Equally, a SW won't just come and remove him from you. This would have to be with your consent under s.20 for him to be voluntarily accommodated, where you retain all PR and can withdraw your consent for this and request he is returned to your care. The other ways he could be removed from you are for example, if the police ended up visiting for any reason and they felt he was at immediate risk of harm, they could utilise their powers to protect for up to 72 hours, then a SW would find a suitable placement for him which you would be consulted about, ideally in his network, last resort would be foster carer. The other way he coul be removed is through a court order, which requires substantial information that evidences threshold is met to enter care proceedings, then a judge look at the evidence submitted and make an order if they feel necessary.
None of these options sound like where you are at, I just wanted you to understand how processes work and hopefully alleviate some fear. SW's are there to help, not battle against you. Honesty is always the best policy. No matter how bad you think things are, chances are the SW has heard worse.
First steps, speak to your GP for advice in a sleep hygiene routine. Insomnia is never helpful.
Take care OP, you sound like a caring and nurturing person in a difficult place right now.