When it comes to therapy.. in theory, you should be able to tell the truth. In practise - like you said, some people get in trouble for it. However generally speaking, as long as you do not express intent to harm yourself, it should be okay. Talking about wanting to die will not put you in the ward. Saying you're planning to, most likely will. It always depends on the therapist, I was lucky to find one who I can be open to about everything. Well maybe not a direct "hi I will attempt suicide this evening :3" but talking about actually wanting to do it and having rational reasons to... So therapists like this exist, but it's reasonable to be cautious. It also really depends on the country, from what I observed, and the local laws - in the US for example hospitalizing people seems to be more common than in other countries because more responsibility is put on the therapist.
So that's it with suicidal ideation. When it comes to hallucinations, I do not know much. In theory, good professionals should know how to handle working with it without force. But I don't know what it's like in practise. Most likely depends on the nature of hallucinations and if they can potentially lead you to dangerous behaviors.
When it comes to medication - everything depends both on the substance and the person taking it. Generally antidepressants should *not* flatten emotions, it's an unwanted side effect and doesn't happen always. I'm talking about SSRIs here, because these are the most popular meds and also those which are most known for causing emotional blunting. SNRIs are much less likely to cause emotional blunting while generally being similar to SSRIs, for example. And there are also other types of meds which do not have a risk of that side effect at all. Overall with side effects - some people get terrible ones, most get some annoying-but-worth-it ones, some people get no side effects at all. I personally had no side effects from fluoxetine (a SSRI) other than loosing weight at the beginning, but it stabilized later, did not loose my emotions (I actually started experiencing positive ones again) and it generally improved things for me. Also most meds do not influence weight significantly in most people - but different substances have different risks. SSRIs can have some, but not very drastic effect on weight. Some antipsychotics like olanzapine or quetiapine, however, can influence it a lot. In general - it's good to research every medication you're prescribed before taking it, to know what the most common side effects are and if it's likely to help you or not. It is possible to predict it at least roughly. Also most medication side effects are reversible, especially if you notice them early and stop/switch the med.
Generally I'd say that trying medication is worth it, it can really change a lot for the better - not for everyone, of course, but it's not like it's always miserable. The trouble people most often have with it is that it either doesn't work or is not enough. Still worth giving it a shot, I think, just research the substance before starting.
I cannot say much about the alcohol problem because I don't have much experience or knowledge, but what I know for sure - is that, as you noticed, this way of making yourself feel better is not necessarily good for you. Still it's what you're doing to survive so you don't have to be mad at yourself for it. It's a part of a bigger problem, certainly a hard one, but it doesn't erase the possibility of recovery. Lots of alcoholics/addicts in general do eventually get better.
