Yes. But there is also an antiemetic available OTC: Diphenhdramin(e)(chloride, sold with different brand names worldwide.
Benzo OD usually don´t work. But there are other methods in combination with benzos:
	
	
		
			
				
			
			
				
				Translation from German  "Selbstbestimmt Sterben - Handreichung für einen rationalen Suizid (German Edition)                   Jessica Düber           Amitriptyline guide  "Tricyclic antidepressants  General info  Tricyclic antidepressants are psychotropic drugs with a general mood-lifting...
				
					
						
							
						
					
					sanctioned-suicide.net
				
 
			 
		 
	 
	
	
		
			
				
			
			
				
				Translation from German "Selbstbestimmt Sterben - Handreichung für einen rationalen Suizid (German Edition) Jessica Düber    Chloroquine   "General info  Chloroquine is a drug used for the treatment and prophylaxis of malaria and for the treatment of rheumatic diseases. Cause of death in case of...
				
					
						
							
						
					
					sanctioned-suicide.net
				
 
			 
		 
	 
This is just general information. I do not encourage you to commit suicide and to use these methods. You act on your own responsibility.
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Sk3le, I missed your message.
E250 doesn´t tell you anything about the grade and purity.
	
According to the labels you (unfortunately) posted, your SN should be ok (purity 98%, NaNO2 is right).